Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f1760eebc0a63d…

MALICIOUS

PDF

248.7 KB Created: 2018-10-24 10:09:17 +01:00 Authoring application: Microsoft® Word 2010
MD5: 7e4ae9139afeb17d897e7bdc42542e97 SHA-1: 5ddb5bd76b5e47da5a70784e0924d56b0858d0b2 SHA-256: 13f1760eebc0a63dc6b8c3257dde07f56f4ce8d5d5091a84e83f4b5c38bdebe6
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a shortened URL (https://is.gd/0uGPnK) which is a strong indicator of malicious intent, as identified by the PDF_URL_SHORTENER_URI heuristic. The ML classifier and ClamAV detection further support its malicious nature, flagging it as Pdf.Dropper.Agent-7231586-0. The document body, though heavily obfuscated, also contains references to the shortened URL, suggesting it is the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5871

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7231586-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7231586-0
  • Clickable URI uses URL shortener medium PDF_URL_SHORTENER_URI
    PDF contains a clickable HTTP(S) action whose destination is a URL shortener. This hides the final landing page from static review and is common in phishing redirect PDFs.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://is.gd/0uGPnK
    • http://www.microsoft.com/typography/ctfontshttp://lucasfonts.comMicrosoft
    • http://en.wikipedia.org/wiki/MIT_License
    • http://www.microsoft.com/typography/fonts/default.aspx
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://www.microsoft.com/pkiops/crl/MicCodSigPCA2011_2011-07-08.crl0a
    • http://www.microsoft.com/pkiops/certs/MicCodSigPCA2011_2011-07-08.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0
    • http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl0^
    • http://www.microsoft.com/pki/certs/MicRooCerAut2011_2011_03_22.crt0��
    • http://www.microsoft.com/pkiops/docs/primarycps.htm0@
    • http://www.microsoft.com/Typography

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0000f2cf.bin
9d409f478cfadcd085833c3d08e915f433198b57714775bb36402b406b6c50b4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF2CF 550480 bytes

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