/usr/share/applications/kde4/ is in okular 4:16.08.2-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/applications/kde4/okular.desktop
/usr/share/applications/kde4/okularApplication_comicbook.desktop
/usr/share/applications/kde4/okularApplication_dvi.desktop
/usr/share/applications/kde4/okularApplication_fax.desktop
/usr/share/applications/kde4/okularApplication_fb.desktop
/usr/share/applications/kde4/okularApplication_ghostview.desktop
/usr/share/applications/kde4/okularApplication_kimgio.desktop
/usr/share/applications/kde4/okularApplication_mobi.desktop
/usr/share/applications/kde4/okularApplication_ooo.desktop
/usr/share/applications/kde4/okularApplication_pdf.desktop
/usr/share/applications/kde4/okularApplication_plucker.desktop
/usr/share/applications/kde4/okularApplication_txt.desktop
/usr/share/applications/kde4/okularApplication_xps.desktop