Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d828cfe24c5f8…

MALICIOUS

PDF

48.0 KB Created: 2021-01-11 06:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8013e1b8a637565335673390ce0f952e SHA-1: 825fdac084c806473043a5c3e42f78b60baad943 SHA-256: 337d828cfe24c5f82f76b801571923241bc4ef9cae5c1c86a6e49a81f44221c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6450

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://trafffe.ru/123?utm_term=integral+of+ln+x%255E3
    • https://site-1168030.mozfiles.com/files/1168030/madrid_zombi_apk.pdf
    • https://site-1200721.mozfiles.com/files/1200721/nfl_scores_11_29_20.pdf
    • https://site-1179590.mozfiles.com/files/1179590/lyrica_side_effects_rash.pdf
    • https://site-1167978.mozfiles.com/files/1167978/gufubukedudomun.pdf
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/6b59573d6616c62.pdf
    • https://site-1175524.mozfiles.com/files/1175524/47590683447.pdf
    • https://site-1171584.mozfiles.com/files/1171584/sudora.pdf
    • https://site-1177862.mozfiles.com/files/1177862/slide_away_meaning_of_the_song.pdf
    • https://cdn.sqhk.co/gitopedevid/fjaW0Ae/lowodisodisemetoj.pdf
    • https://cdn.sqhk.co/pawosuku/hjhhtic/geometry_dash_lite_beating_all_levels.pdf
    • https://cdn.sqhk.co/vafodagusun/jdX15jd/flow_by-_hour_hotels_workspace_staycation_deals.pdf
    • https://gajokazatiduker.weebly.com/uploads/1/3/4/3/134320060/luvunudobileba.pdf
    • https://cdn.sqhk.co/roweziwamu/eKiiibL/umc_pay_stub.pdf

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