Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a37cb9d9dc5f64…

MALICIOUS

PDF

74.0 KB Created: 2021-07-12 20:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 530ec5003051645b5313d3ae952467a9 SHA-1: ebc28bc350033851b2cb7b516cd854235cb55e95 SHA-256: 99a37cb9d9dc5f641e7944caf311e8d00a57485e35123bc8580fff9b3c761496
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'oniceh.ru', which is likely part of a phishing or credential harvesting scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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://oniceh.ru/square?utm_term=sync+reminders+mac+and+iphone
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7e185f604029b990e436/1626111512687/clay_building_material.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e78be652059f1ec1df1169/1625787367204/zenigamuzovixo.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec77bc700aa07a78939721/1626109884900/14600586425.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_off0000c22a.bin
660159491215f721ea94cef682e27ad78aac23ac202378ad1d7a262eea8c1cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A 16000 bytes
font_01_sfnt_off0000ebc6.bin
1e1bc43f720a251ca6aa5ce5f65544afd2e42ecc9230fb59f72087909a3a5993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10824 bytes
font_02_sfnt_off00010483.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16792 bytes

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