A recommended protocol to effect this reduction is the use of catalytic amounts of an active metal in a hydrogen atmosphere such as H2/Ni(Raney) or H2/Pd(on activated carbon).

A similar question was previously asked on RG. Check the link below to get more suggestions.

https://www.researchgate.net/post/How_do_you_do_reduction_of_aromatic_nitro_or_nitroimidazole

I actually tried reducing nitro group of 9-nitroanthracene using H2/Pd system is it was a messy reaction which was surprising (granted the middle ring of anthracene is a lot different than a benzene ring) so I then tried a Sn/HCl system which worked great (80% yield) to give the hydrochloride salt of the amine product. Treating this salt with some aqueous NaOH gave the free base.

For the reaction scheme above, it is not advisable to use an equimolar (or excess) amount of a heavy metal such as Sn, because of the possibility of complexation of the heavy metal with the nitrogens of the 1,3,4-oxadiazole moiety; which will results in long reaction times and definitely poor yields.

Hydrogenation unlikely to work as you will get catalyst poisoning

I once used metallic zinc in refluxing ethanol/water with calcium chloride. Mild conditions and large functional group tolerance.

Best procedure for the reduction of aromatic nitro compounds is to use hydrogenation reaction using H2/Pt . However, Fe/HCl is cheaper method as compared with Sn/HCl or Use of sodium sulphide.

Thanks a lot for the informative answers

As Nick Evens said, you have a free thiol in your compound, this will poison the metal catalyst. I'd go for Bechamp reduction (Fe/HCl in ethanol) or any variation of that (metallic powder of Fe or Zn in HCl or acetic acid in whatever solvent you like). I've heard of tin chloride as a reductive agent of nitrobenzene to aniline, but I haven't seen it in action.

Nitro compound, Fe powder, ethanol and acetic acid, rt or reflux

Or

Nitro compound, Fe powder, ethanol and ammonium acetate, rt or reflux

Or

Nitro compound, Pd/C or raney Ni ethanol or methanol under hydrogen atmosphere at rt or heating (autoclave or parshaker or steel bomb for heating)