/usr/bin/aarch64-linux-gnu-as is in binutils-aarch64-linux-gnu 2.24-1ubuntu1cross0.11.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/bin/./usr/aarch64-linux-gnu/bin/as
/usr/bin/./usr/aarch64-linux-gnu/bin/as