Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ae8439960e35f…

MALICIOUS

PDF

77.6 KB Created: 2021-07-15 11:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9f4caa753811e6ed0f06e9a2aa141fb SHA-1: 2c37d4d83d8a86b1c55283f9a9e9840b0ada37a6 SHA-256: 869ae8439960e35f5bba1eee26546841855eeafedb1e87e50550c75bd6a90d9f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier. It contains an embedded URI pointing to a suspicious domain, crysiq.ru. While 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, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://crysiq.ru/square?utm_term=another+word+for+life+jacket
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8b8154a52c186ce5d51c/1626114945675/96615096905.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e95c5918245d33f18366e6/1625906265503/sakaxekevatutukezokov.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60efd365bba06d2f3416df0a/1626329957396/vezazavuvolonaxules.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee86e102e0767984f780d9/1626244833630/57486492083.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e79698f29cd6423db07905/1625790104213/guitar_picking_patterns_for_beginners.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_off0000c9f7.bin
fdb1f8bc52924aa795f84e99cbc468a72564539753c339a40c7e45830d146da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 17780 bytes
font_01_sfnt_off0000f888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
font_02_sfnt_off0001109f.bin
02cdfad47d630cbfca6444eb46fb7eeec9c0ad1f683228689e6cc96746749467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10696 bytes

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