Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e714e6b9c8298fe…

MALICIOUS

PDF

281.5 KB Created: 2021-07-12 21:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a23dfcd3d1f40f5df0d1278bd8495c7f SHA-1: e533915b145faaf3d263547ab0440d10e0de94ac SHA-256: 8e714e6b9c8298fec6263f31105f3590aada1d2cbc7f4afb416e000579442d0a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to a suspicious domain, 'chcial.ru', which is likely used for phishing or to host a secondary payload. The heuristic 'SE_URGENCY_LURE' indicates the document uses language designed to create a false sense of urgency, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier clean score 0.0577

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/square?utm_term=expeditious+retreat+pathfinder
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e834361873c46ac93d3565/1625830454124/sudden_ear_pain_causes.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_off0003f65e.bin
6e9d866e8c3a46796447d76e8c8d0b127f4b89527fce7ea1b199036dd49a5be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F65E 10732 bytes
font_01_sfnt_off00040ef6.bin
f97e4aeed9437b52936248e3371e8859e8debd09c96b41404b9ea1d5b21017f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40EF6 18900 bytes
font_02_sfnt_off00044181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44181 16792 bytes

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