Malicious PDF — malware analysis report

Static analysis result for SHA-256 df25a15cd86b5928…

MALICIOUS

PDF

76.1 KB Created: 2021-07-12 20:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74c692af33751f074144206071267598 SHA-1: 4c5af306e3ec6231727d16ddf3144ab4e2a1b699 SHA-256: df25a15cd86b59284067befacd85f936f5a8696bf9a8a8e1b8528c89ab36a51f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to 'crewmak.ru', which is flagged as suspicious. ClamAV detection and ML classification indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, but the presence of the external URI is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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://crewmak.ru/square?utm_term=automatic+only+driving+license
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8432a5894ab223f27682c/1625834283123/windows_7_ultimate_sp1_iso_download.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e87a5272e3b9538dbb0452/1625848402388/tap_tap_apk_download_free_fire.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e86bd084b8863bdd3ed9fe/1625844688942/14944646770.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d1add2ac847ff7df09f/1626111258695/93976501240.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_off0000c56a.bin
3c6e5cecb308777402faf3a46c80566e150df0513e959859acd2789b03e311c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 17536 bytes
font_01_sfnt_off0000f34a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
font_02_sfnt_off00010b61.bin
3b36d75e703c8747a0df5c75d69408b7bd89c3058e889a9a872d1c6550d9903e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 10972 bytes

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