Malicious PDF — malware analysis report

Static analysis result for SHA-256 303f33fc677b6f2a…

MALICIOUS

PDF

81.1 KB Created: 2021-07-13 00:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 380802c6225ec0c73b4ba57070324529 SHA-1: 00de45514a6d4556dfe81155e8376e83d1f0cd1c SHA-256: 303f33fc677b6f2a76e32b64a747894a2090a1a917e854613448c31e2c1db4e1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, 'catamma.ru', which is likely used to host malicious content or phishing pages. The PDF structure itself does not contain readable text, but the presence of the external URI and the ML detection strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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=fix+sd+card+android
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecad595338e9546e4b2f39/1626123610206/wepuvobuxekiwafudosij.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecad687dc7460dd09f0afa/1626123624561/lulokifozatununasa.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e908b4b132fa362072754f/1625884852404/nejadelirerefazafuw.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e81a2c80504e0a776c3555/1625823788716/american_literature_quiz_with_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80acb4261ba798062e8c9/1625819851455/jezekivuwuwowuxiwabolinok.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_off0000de1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 16792 bytes
font_01_sfnt_off0000f633.bin
45145dcc933f4660e3ec82889c649dcf9c848b6f2eb2986b45471f9f63c9a904		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10168 bytes
font_02_sfnt_off00010cff.bin
670e5d7adca7b1d68850f4d783e5c631990830b72720c513cd82885edfa1e0c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 16844 bytes

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