Aug 6 (Reuters) - Petroleo Brasileiro SA Petrobras :

* BRAZIL STATE-RUN OIL COMPANY PETROBRAS CONFIRMS DUE DILIGENCE TO BUY MATARIPE REFINERY IS WRAPPING UP - FILING

* BRAZIL'S PETROBRAS SAYS IT HAS NOT SENT ANY OFFER OR SIGNED ANY BINDING DOCUMENT TO BUY MATARIPE REFINERY Source text for Eikon: Further company coverage: (Reporting by Sao Paulo newsroom)