Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb723b6f58278d2…

MALICIOUS

PDF

97.9 KB Created: 2021-07-15 15:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4d7a4f8c42f7014397e806c838d4dfd SHA-1: 80911a7fbf7e1588917742f517c6eb0bba610047 SHA-256: 0eb723b6f58278d2b97b0f5f9ad17fc7ea675781eec3f1c800a06e091dc0ae73
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains an embedded URI pointing to a suspicious domain. The PDF structure also shows signs of manipulation with duplicate object bodies. While no scripts were explicitly extracted, the presence of an external URI strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7887

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://infrive.ru/square?utm_term=iron+is+stored+in+the+liver+as
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92ed1e6a58043b6921b0a/1625894609151/96927983594.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d456d0799e4214c03a5a/1625805910665/48847065846.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7902de8c3264fe5dd690/1626110210320/997752457.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8b314f0e3534f504b74c7/1625862932792/model_t701_thermostat_reset.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eda55dc8312e4ee1df1b23/1626187101381/mathematical_modelling_in_control_system.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_off00011daa.bin
43bb35d72f9d49f052417de750a3b05bcfd3edc0edcfc67d6919431c3dcad018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 17936 bytes
font_01_sfnt_off00014c56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C56 16792 bytes
font_02_sfnt_off0001646d.bin
6bf52de510a1b4a7ea3245eae3c985191906bad0affa361ad3c823664af7c9ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1646D 10360 bytes

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