Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb76fef3420d0a38…

MALICIOUS

PDF

75.7 KB Created: 2021-07-12 22:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88e792b8339146cf29187dfd285e414f SHA-1: 73eefddba1a8bfa87330afe3252f8c7ae9e922b2 SHA-256: cb76fef3420d0a3838d6bc51ebadf6709b4082ebba54439a1896e8f422b80df8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded URLs, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and detection indicate it's designed to exploit vulnerabilities or trick users into downloading further malicious content, likely through a mechanism related to embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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/sq/ugae/~3/pL_UGxDroB4/square?utm_term=chicken+in+satay+sauce+chinese
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8295b6dedd3ae1689f3b/1626112661666/63966727049.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d4b5c81c3e1fd72a0cc5/1625871541184/visazixojepifobinimezage.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e76dd83a57136d255a9f80/1625779672467/38447802779.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8624dcef4a49b3ab1f97/1626113572165/both_teams_to_score_and_over_2.5.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7acedcef4a49b3a9f058/1626110670815/wazivikebikazotumikoxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c953.bin
900b749e95cc8a2e8a539db77b291dce929f10bad8d3a7f519767149e83232fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 16276 bytes
font_01_sfnt_off0000f34d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16792 bytes
font_02_sfnt_off00010b64.bin
139c352684ea4129e53ab3f1caf048b87de33db346aaa5db03b5de66d1f86829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10400 bytes

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