Here is what I found out. Its a modification of the Yak-9D series. The modification consisted of replacing the rear cockpit with a bay that could house 4 bomb bays, placed in pairs. One behind the other. In each could be suspended four FAB-100 (220lb) bombs. Alternatively four clusters of PTAB 2kg anti tank bombs could be carried. The gun armament was the same as the Yak 9D.
A series of production batches of around 109 aircraft where built and delivered to the 130th Fighter Division command by F Shinkarenko. Operational trials where to prove unsatisfactory due to the lack of a special bomb site and bad handling qualities when loaded with bombs.
So far I havent found a better picture and I have no clue on how many bombs are in a cluster for the PTAB 2 but will keep looking.