This paper model is a SU-122-54, a Soviet tier 9 tank destroyer, based on the WWII Soviet self-propelled howitzer or assault gun SU-122 (Samokhodnaya Ustanovka 122 mm), from the World of Tanks game, the papercraft is created by WarGaming, and the scale is in 1:50. There is also a SU-122-44 Paper Model on the site.
Development was started in the summer of 1948. The T-54 tank was used as a basis for this tank destroyer. The vehicle entered service in March 1954. Mass production was launched in 1955, with a total of 100 vehicles manufactured. The principal configuration of the vehicle is similar to the configuration of WWII assault guns. The SU-122-54 leads to the Object 263.
You can download this papercraft model template here: World of Tanks - SU-122-54 Self-Propelled Artillery Free Paper Model Download