Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8192b9dcf8cfab8…

MALICIOUS

PDF

67.9 KB Created: 2020-11-14 19:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8f300b0aed8a145f3742bad5856be776 SHA-1: 14ce82664f0533b8790288efa77924002a7fda0c SHA-256: a8192b9dcf8cfab8517319be3b4f780d515f05a9bcf0184f9c722df72f770c55
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/strik?utm_term=feminine+khajiit+textures+sse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f8f8e334dd43.pdfIn PDF document text
    • https://nilitimuxuzadox.weebly.com/uploads/1/3/4/3/134320754/0a993c487.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/0326ba603fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f8dfe61b8298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5f9d4de6e7718.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/706638.pdfIn PDF document text
    • https://zarugekikivupa.weebly.com/uploads/1/3/4/4/134480545/761c2df9abb38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fa2316b15ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5fa0b896d4c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5f9bbfcbc58c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f897de8b870b.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/xasixexejasewonumam.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/9186477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/cession_de_vente_d_un_vhicule.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/peneximexufikasov.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_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 5056 bytes
SHA-256: 25bd9186609fba3c152c8fee365415ce93cdf1f345119d388eff77b6393df90b
font_01_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 10876 bytes
SHA-256: 11ae2dc86058578bba7c3fa540f27071559e34d7a0c96461572779fb574dc0cf

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