/usr/lib/debug/.build-id/bf/ is in qtbase5-examples-dbg 5.5.1+dfsg-16ubuntu7.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/bf/505d63bbb6a9ccf6b703303f1fb50a440e3aa1.debug
    
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                application/x-executable | root:root | 0o644 | 672.6 KB | 
                    
    
    
    /usr/lib/debug/.build-id/bf/fd3224e0d000bd6706011baef86bbb6f705647.debug
    
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                application/x-executable | root:root | 0o644 | 254.1 KB |