/usr/bin/scan-build-py-4.0 is in clang-tools-4.0 1:4.0.1-10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../share/clang/scan-build-py-4.0/bin/scan-build
/usr/bin/../share/clang/scan-build-py-4.0/bin/scan-build