This tank paper model is a Jagdpanzer 38(t) Hetzer (Sd.Kfz. 138/2), based on a modified Czechoslovakian Panzer 38(t) chassis during the World War II, the papercraft is created by iCardTanks, and the scale is in 1:48.
There are other three versions on the site:
WWII Hetzer Light Tank Destroyer Paper Model
Girls und Panzer - Hetzer Tank Destroyer Paper Model
Mini WWII Panzer 38(t) Paper Tank Model
You can download this papercraft model here: WWII Jagdpanzer 38(t) Hetzer (Sd.Kfz 138/2) Tank Destroyer Paper Model Free Download