I don't know of any Urdu corpus, but I have one in Arabic, in case you might find the process similar or useful:
On Wed, May 17, 2017 at 1:16 PM, Aneeta Sheikh <aneeta_2013 at live.com> wrote:
> Respected Sir,
> I am a university final year student pursuing MS degree. I am working on
> a project on Aspect Based Sentiment Analysis in Urdu News articles
> I am looking for a corpus in which the data is differentiated into various
> political aspects.
> It'd be greatly appreciated if anyone could share.
> Thanking You and Regards,
> Anita Shaikh
> NED University Of Eng and Tech
> Karachi, Pakistan
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