Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a7085725a79416…

MALICIOUS

PDF

78.2 KB Created: 2020-11-24 22:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a97c73b706d2b4fe2988271dd86c1131 SHA-1: 7140ecae1bdc726c30ab57af9a3de7f0a9122125 SHA-256: 40a7085725a79416bbac43a20d3cede6dfe114c5334c957f780d41da7a98c06e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical heuristic firing indicates it's a malicious redirector. The document body, though heavily obfuscated, contains text related to 'downgrade ios' and the file metadata indicates it was generated by wkhtmltopdf, suggesting it's a crafted lure. The presence of numerous links and the redirector URL strongly suggest this document is designed to lead users to malicious sites, likely for phishing or malware delivery.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/strik?utm_term=downgrade+ios+8.4+1+to+6.1.3 In PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/lebavajepilav-zuwowizoval.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/c9cde48619.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/012ec4e0df6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f8f89bd83741.pdfIn PDF document text
    • https://vezutubiwewo.weebly.com/uploads/1/3/4/5/134507618/rukuw.pdfIn PDF document text
    • https://kodopagedo.weebly.com/uploads/1/3/4/3/134350575/ritaran.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/0e81a5aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_5fb3c61b1fb8f.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/247de5b1-8f85-4b25-9735-483d49dd5802/hasbro_mission_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/33319067859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce49e2cd-8ad8-45bf-bdab-8eb576cca06a/84300476047.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/app_rewards_win.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264da9ef-256b-44bc-a431-b6411848da00/87946357356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45173d2d-ce7c-47ae-878c-a05256b00108/52319947682.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010653.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10653 21720 bytes
SHA-256: 5fef1a30aef0331f642997705a7af44419450f29d5150cd1966cb934b403f65b
font_00_sfnt_off0000cc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC79 5736 bytes
SHA-256: 90537edd65a1b1877225542343b8231f055da865077819b6a2d16f1564b62d70
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 11516 bytes
SHA-256: a236be66d48531f30a8e5b59e62c816630458d1135b54e35e51d82e95ce7ce3c

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