Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97c4f9a89879e7f…

MALICIOUS

PDF

72.3 KB Created: 2021-07-13 19:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db53b1a437fdb3e894a9cedbad47acc7 SHA-1: b86b29cdf28daadde61cc0f805fa8328e79ec5f4 SHA-256: f97c4f9a89879e7fd3e5d0837f92e3f42de0766e70ed8a272d73c952205d60da
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or phish for credentials. The PDF structure and embedded URI suggest an attempt to trick the user into visiting a malicious site, consistent with spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.1869

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/square?utm_term=parallel+computing+mcq+with+answers
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec91e24f558d0bf39cea6a/1626116579126/pexotabivenitebeju.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec818a82b4c978cf416deb/1626112394850/tedox.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_off0000bc32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC32 16792 bytes
font_01_sfnt_off0000d444.bin
77916b57b0cf98e82c7bc5fca8b6c3084e98531f1e03b3d87754b0bbeda75d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 15540 bytes
font_02_sfnt_off0000fbd0.bin
5faf7e3d031b4bc351aa3a5f1e3ffd1f59c063c4bed7dbd077f9f0660bd04d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 11156 bytes

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