Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c1da3dd504b2b3…

MALICIOUS

PDF

87.5 KB Created: 2021-01-10 08:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8fd8458ba2f5634e081a6086a5e3ca48 SHA-1: e6866216a3bc6e3ea7b7ac04b7974a636cbe4f40 SHA-256: 35c1da3dd504b2b360650ec60cf96e5f1c36f91fa15c1a9c3e86e525e44f6ec7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffking.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to lure the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffking.ru/123?utm_term=amtrak+zephyr+schedule In PDF document text
    • https://cdn.sqhk.co/fubafonu/UYiaheY/beauty_queen_royal_salon_spa.pdfIn PDF document text
    • https://site-1174826.mozfiles.com/files/1174826/topps_champions_league_2019_20_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fdec7d7f134d.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizajo/cjaggji/learn_robotics_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/iRjhdgi/lekijufevutima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff6988f3061c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443292/normal_5fb3d3701baff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fe500406e0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fb019018fe74.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/carnage_battle_arena.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/mokuwanibof/android_high_cpu_usage_idle.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 5520 bytes
SHA-256: 83c00fcd3ffcb975f8445563f09ebd798d6ad46a6a2473080ed4d83e0d243442
font_01_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 12000 bytes
SHA-256: 09ccfb4a77d1d4325b596089c7693222eca39892d3bb306428cab4d04d4cfe08

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