Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0a9851461fcdb0…

MALICIOUS

PDF

65.8 KB Created: 2020-11-14 11:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5e1449b18c85fe80b8b8a8223d302ee0 SHA-1: dd205f267a70d617ee3579ad7ed977be38e3cd36 SHA-256: db0a9851461fcdb0d9c8188aa574cc8f284cd7e1ca32c78dcc5afcfbcc180a6d
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 'https://traffking.ru/strik?utm_term=chapter+12+study+guide+biology'. This URL is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=chapter+12+study+guide+biology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5f9a442284e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f8d8a30c70c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f718a2f9-024e-44f4-96e6-3df58c3d092e/73046044539.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/baby_boy_names_in_tamil_font.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/15_tricky_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dd6bb5-faef-480d-8bb8-0ef02bd1a0ce/86533746217.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/73744890153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494390f3-8bc8-4d7e-aced-03a1258c67ec/nobivadoni.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/6283207432.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/equivalent_expressions_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a85c4ae-f271-4226-9030-9bfc687ae847/zapoxofodofidatanab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5620ed9-b4d4-4ae3-8277-37b9f5c92d31/85030046938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9d21f1-2121-42f2-9144-14bf431ef279/nakikodolezimipitexelu.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_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 5552 bytes
SHA-256: 95535edc83b599922b55c069e707b0fbb4dc4c5cfc8e27752232c804ea1c782d
font_01_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 10444 bytes
SHA-256: 539b74d7fb54c7d8b626e497647cdc83fe91fcfc25cb28e1d04505086630890a

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