Malicious PDF — malware analysis report

Static analysis result for SHA-256 609e3c2fba0699b6…

MALICIOUS

PDF

91.3 KB Created: 2021-04-13 06:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d451e97f90d083a252da144222c9f63d SHA-1: e63a72185fb44fdb0df01d39a05661bf4399c04c SHA-256: 609e3c2fba0699b617d61b96bdbd6bc354f17cc2c0ed1ac30e6ec651d2ebc89e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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
  • 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://druttle.ru/strik?utm_term=how+to+use+the+bowflex+power+pro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471692/normal_5fe8bc4018834.pdfIn PDF document text
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/mifagadeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5fda1a82a70fc.pdfIn PDF document text
    • https://nuzunuge.weebly.com/uploads/1/3/5/3/135399682/zokanogidenalas.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/28946099299.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/nozipewolifixexelonaf.pdfIn PDF document text
    • https://suxozunepewax.weebly.com/uploads/1/3/2/8/132814427/kajemeveser_nuvop_sisamekapenuki_sisaxezubuvagak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_604306caf1a7f.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/4921120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_6028054a865c7.pdfIn PDF document text
    • https://makumanufomogo.weebly.com/uploads/1/3/0/8/130874647/bbeb29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_6052a1dd4231a.pdfIn PDF document text
    • https://pewuwokajop.weebly.com/uploads/1/3/0/7/130775265/41b37ae49a8.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/ropuvevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_1d6948fef0584454a12c9fd19ee1f306.pdf?index=trueIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_95c2106fcb2343d996339ad522470923.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f63e8b07705e452d86b8b92798a3c3eb.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_0427c9cfd44040b792fb21aeb205e9fd.pdf?index=trueIn 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_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 5040 bytes
SHA-256: b7090453cff32753e205476ce943722c151a333add63ea9cd3d9ea64a73a2a34
font_01_sfnt_off000136b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 12840 bytes
SHA-256: b6e82eb7dcae5f85ae4ad3d08d31d9e9981bbc9c77036facada777df85956d3a

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