Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d00d1d2ee09202…

MALICIOUS

PDF

69.8 KB Created: 2020-12-05 14:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 474590377336fe30aef4b38d7484d97e SHA-1: d66002f24c597b999fdb322d6f2a86bf7b8412d6 SHA-256: b8d00d1d2ee092026d4c0c9c0728614d9b3d1c167d75686e0b0d9cdccc7e3c1a
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 of which point to suspicious or disposable hosting domains, indicating a link farm or redirection scheme. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=gtr+black+edition+interior In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_5fb56a73d2771.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/lodobefilil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f8c89d427a8f.pdfIn PDF document text
    • https://nikalakikezune.weebly.com/uploads/1/3/4/7/134753818/sakozenejur_najem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f8f8716e26be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_5fc03426f1542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f8e43d112d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_5faedaccead9c.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fc90f4bb35b5.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/583209.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/5fbce344be7cfc36344e8aaf/t/5fbceea572f8b574a0f1f3cb/1606217382713/true_t-23f-2_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/maquina_aplanadora_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe32191972c46e3c699a3d/1606300186293/running_with_the_buffaloes_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/wubaluxenigizuzemeru.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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 4988 bytes
SHA-256: 4f4832e6cfe93afd73b7ba8ce112f0acf38009ab53f00ccaea28a1953b354fd8
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 11576 bytes
SHA-256: c0ab35e2d001be08599c06eb11db165ed24d6e8245ef6a1f6a91690827e06a77

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