Malicious PDF — malware analysis report

Static analysis result for SHA-256 f362b27ffc8a078e…

MALICIOUS

PDF

83.6 KB Created: 2021-07-14 03:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 39e6aaaf7ae8f5e2a5a334859160a3e0 SHA-1: a2fcd74bae790185f5dc5617eadcbada15a636c8 SHA-256: f362b27ffc8a078e779ec613428d7cd24ac4188810e11dbc91393a0e2cc08f4d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URI pointing to 'https://crewmak.ru/square?utm_term=opposite+of+weeping', which is likely a phishing lure. While 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, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0989

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://crewmak.ru/square?utm_term=opposite+of+weeping PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7ef6288cf71862a90c62/1626111735296/alpha_phi_alpha_fraternity_incorporated.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e526.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE526 17856 bytes
SHA-256: 545640f8e90377f20e5ce7ad353ed8283ee3aad11c8dfdb66293dad981b3c284
font_00_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 16508 bytes
SHA-256: cf8c12b04d1a67660f8e24247e6f0d579f8e3388f538559e41c839bd427f926f
font_03_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10336 bytes
SHA-256: 2640c9702b90c5b4ce0da1796961b943331d70de1245ff2d7d2798a8041a04a6

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