Malicious PDF — malware analysis report

Static analysis result for SHA-256 0254b71571590954…

MALICIOUS

PDF

79.2 KB Created: 2021-07-15 21:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94dca63d6fe8a0381d57e5a9d17886e8 SHA-1: f79e74360598fc33910abaad1f72485a10fb6864 SHA-256: 0254b71571590954d61fe3349a663d4491730ebd0a6846efe941adf0a955a45a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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=animal+cell+culture+question+paper
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee1962f6c772366d2b395b/1626216802327/riwunafabozibarujofur.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8cdbb8016c0d1ad7fd8e/1626180827576/41232630202.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda4bcb564270cd6e9ced2/1626186940668/suderiwuxoruramalil.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f026894980ba6b3b708fa7/1626351241599/parking_for_helvellyn.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee1a6a2af4c01978fa3d85/1626217066307/43115169431.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_off0000d6ae.bin
dee274fe84ec3bd9cbda2562dd754c313d39c7645474a7acbb01691c678d6a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 16080 bytes
font_01_sfnt_off00010046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
font_02_sfnt_off0001185d.bin
fb8ac80d63a6585a641eeed25707796c460d75baf9e7f09f18d05d93c3fb2090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 10760 bytes

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