Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c1db21ab56a8d7…

MALICIOUS

PDF

344.5 KB Created: 2021-08-15 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3e193bf15de919d9f9bc5649974033c8 SHA-1: 866c5eb3a1d6470a36fe0750f61ba559ba89e403 SHA-256: 58c1db21ab56a8d7a4c66be307d0ecb65f4362bafb4149a48e77a6e5dac417d2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URI pointing to 'https://crewmak.ru/uplcv?utm_term=voc%C3%AA+nasceu+rico+pdf+gr%C3%A1tis', which is likely a lure to download a payload or phish for credentials. No scripts were extracted, but the PDF structure and external URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0181

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/uplcv?utm_term=voc%C3%AA+nasceu+rico+pdf+gr%C3%A1tis PDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA38 11156 bytes
SHA-256: 8b0439f482608a3fd9564d25cfd6526dd9ded23006ac0fe1c2f3cca2d9f3b118
font_01_sfnt_off00050396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50396 21152 bytes
SHA-256: 142d29f2ae2707b24dcb67d1d3aecfabe8ca3da1d59553dca12c1e3f2698de19
font_02_sfnt_off00053817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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