Malicious PDF — malware analysis report

Static analysis result for SHA-256 150a7e531cfe7bb5…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 03:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5a8bea0c8262417636e7054933d0930c SHA-1: 75e16750e8adc6390b71e097252248fb508c477e SHA-256: 150a7e531cfe7bb52e44621e5b39a50fc9ac903827334ba6414e27aae5d2bd2b
186 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gimoguvi.ru/award?keyword=bounce+back+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fd67d324a0ce.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/58022700197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_601eb67c105e2.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/wajevidos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_601d35f543712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_604d0f0583d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_60667bbb1720c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_605d798abdfcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_602bee50872f7.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/44443284615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6026f667313d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486190/normal_5fdb8e02c1ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6022bca8b1d21.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/b27c13dc-5187-406a-a1b0-d3b348aae924/21948106136.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_81cdfff43c80465c8ceb3647de37c200.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jimugivos/essay_plan_template_gcse.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_89fe65b5a4a242d5ae7612937818f948.pdf?index=trueIn PDF document text
    • http://kipejefanowisu.atwebpages.com/libro_alter_ego_plus_a2.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_2d8b43d62cb743dfba38a79d45f52981.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/97525897503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b498388-f8a4-4915-a94a-d2d569481e50/ruzidabawegitikugirig.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_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 5096 bytes
SHA-256: 96c04e7102a4db4e9cf78d7274ca6bb01c8c54dc2d041f7766b1872452cc09b1
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 11324 bytes
SHA-256: 41475c43c5dc5abf72583270310cedc5a32c0d2758170697119bd91f99f9c637

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