Malicious PDF — malware analysis report

Static analysis result for SHA-256 678e413becd78b44…

MALICIOUS

PDF

74.2 KB Created: 2021-02-10 01:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bfbc49fb41b5572d83d383de8fe987c9 SHA-1: a3312dcd329a6ded607b30f1098be805ca640536 SHA-256: 678e413becd78b44f4f0d3b8dc2337007bb8a74bf12dfa0af7442a9d27110b63
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=subaru+ea190v+pressure+washer+replacement+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fee1e0cb1759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_600125373e790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_601a30eaccf7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d2442a0ce4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5fc6a4b88966c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fede6433e4df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_600280246c954.pdfIn PDF document text
    • https://wiwetiforezopiv.weebly.com/uploads/1/3/2/6/132695432/586da7a50c04a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ff756ef7d317.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/85d3d689a204bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_60104b711b9a6.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/xozeb/juvojar.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/madabepibelekopapiditipub.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/govozumatidewomosapulonit.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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 5920 bytes
SHA-256: 1bd7545664b58e4ac3daa421ac27081b753c8d1a3abb371958f1ca82834f8d06
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 10852 bytes
SHA-256: 85ce27ec69c19a66c702157fdac306893be51ec00cba4f67e07d4887bff1a24f

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