This specific 3D model, "Combat Knife Free low-poly 3D model 2", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The licensing terms for this digital asset are governed by "Unknown license".
OBJ (OBJ, filesize: 658 KB), GLTF (glTF, filesize: 14.1 MB), FBX (Autodesk FBX, filesize: 315 KB), PNG (PNG, filesize: 297 MB)