Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcfbf9cd9ea401b…

MALICIOUS

PDF

80.3 KB Created: 2021-07-13 17:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3af5157f0a94089b4e3e68e970d43a3 SHA-1: c38b1a731d271181f17f6065e7d0696a409228b4 SHA-256: bfcfbf9cd9ea401b36a769bdb7253461cf35dc40e0885ca764c9211b94324e91
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically a phishing variant. It contains multiple embedded URLs, some of which are associated with Squarespace, suggesting a potential lure to external content. The PDF structure also indicates potential for embedded scripts, though none were explicitly extracted or detailed in the provided evidence.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3546

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/um1bUVUAM38/square?utm_term=begins+at+home+quotes
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed935ff2de0a6ebf354caf/1626182495576/jezelodatodobunaf.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c9721b22c82f862d6ede/1625868658632/41000284373.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec826bdcef4a49b3aacaaf/1626112619663/lemubugudiridufufu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed990f7c55557fb27cdcfd/1626183951842/embryonic_stem_cell_research_pros_and_cons.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef9.bin
87ed8a95ad973c38332fa62096f208788a5114e1b107176addb030ed3842a82b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 10708 bytes
font_01_sfnt_off0000e713.bin
d46a823303c479ca7df7311d41a606e683b64d9ba3472de53e14cdad9d41ef74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 1692 bytes
font_02_sfnt_off0000ef22.bin
ed3c0e4ab0886118199f51aff10944f13fb0143a91bfd0e77f56ce74f5ae88d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 17072 bytes
font_03_sfnt_off00011b77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 16792 bytes

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