Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a3cd11976d130…

MALICIOUS

PDF

78.0 KB Created: 2021-01-17 22:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cb5cd225859e352742ddf3df0d91d24c SHA-1: b14240a1c1b18b8a621c2a5ebaf346e67b3bd1c7 SHA-256: 4a0a3cd11976d130a964e6314d87a53945b0d1fff5f991dd8a71f55ff89b1b64
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document body, though heavily obfuscated, combined with heuristic firings for invoice and MFA lures, suggests an attempt to trick the user into clicking an embedded URL. The primary URL, 'https://traffset.ru/123?utm_term=walgreens+custodian+of+records+po+box', is likely used to redirect to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/123?utm_term=walgreens+custodian+of+records+po+box PDF link annotation
    • https://cdn.sqhk.co/bulunazi/gjezVjh/mevadiwikuluto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f8d2710daec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5f9402285f48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8a794a3d0ba.pdfIn PDF document text
    • https://rulutateve.weebly.com/uploads/1/3/4/6/134653171/4816958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ff5f38f55954.pdfIn PDF document text
    • https://guvujuxedudekef.weebly.com/uploads/1/3/1/1/131164066/2794477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcb6f268d4c9.pdfIn PDF document text
    • https://site-1166656.mozfiles.com/files/1166656/zibadavonajabinezep.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/hdiNjbb/pick_me_up_game_poki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/triamcinolone_acetonide_formation.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://scripts.sil.org/OFLIn 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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 5544 bytes
SHA-256: 8a02628ee165915480862b68420d2dd9079ba21178a396ae459c0d8276f88bae
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 11032 bytes
SHA-256: 7b5ffafde5267405892533bf372c2e68d4472d5c94f778547e6c2ce3d3b5ca6b
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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