Malicious PDF — malware analysis report

Static analysis result for SHA-256 637a03dcd083267a…

MALICIOUS

PDF

64.5 KB Created: 2020-12-15 17:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 017a3e34a7b16317ceb80b589127e0cf SHA-1: 9c07640d725a4bab387a4051a1b868543493fe99 SHA-256: 637a03dcd083267ac1d373a8eb1825136508ac6955d9c95a7b435a19dfaed320
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a large number of embedded links suggestive of a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/aws?utm_term=esma+guidelines+mifid+ii+knowledge+and+competence In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fb4ce35d4188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5fd8078f94a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fb274f4b2b70.pdfIn PDF document text
    • https://vubufuzavedorav.weebly.com/uploads/1/3/4/7/134766784/pesavuturiminideku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fc59f2e6b02a.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/a02d2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f98d6bbae9e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f41f116eb00e3c4c3887/t/5fcd81d974a40730fbb00efd/1607303641684/lepoxofada.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/mefisufepinetave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf360145-37bf-4c8a-a41d-29a78b4e962d/free_wood_sup_plans.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e701bda9c57a97be38be/t/5fc15cce7acac6192af3b00d/1606507726887/world_of_tanks_xbox_crew_skills_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf7f61d5d65324e4ae2fc8/t/5fd737849264095525ee7a82/1607939977307/22583934456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16193f16-37a6-4a18-8f2d-fddeb23a3aa8/96105020500.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6500cb3e0f5771477f2e/1606378753420/8_ball_pool_unblocked_games_500.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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 5492 bytes
SHA-256: 6513845c267a374153205e963cf55b93a64920741d63d91507c79c22d57c52c5
font_01_sfnt_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 10688 bytes
SHA-256: 63cc473cf4fc68e464a84b9dd641d64253183edf777cddf3836fbc5dd77063d3

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