According to gazeta.ru, it was a leased AN-12 (Four engine tuboprop). The local airline operating it was "Sky Cabs".
The plane had its first unsuccessful landing attempt in a severe weather (rain storm). Second attempt, after 45 mins in air, ended up in crush. Possible causes: weather or fuel shortage.
5 out of 8 on board were reported to be Russian crew.
// Sources: lenta.ru and gazeta.ru (In Russian)