Malicious PDF — malware analysis report

Static analysis result for SHA-256 6270ebe090b1ef6f…

MALICIOUS

PDF

76.1 KB Created: 2021-02-16 16:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 29d2e1780534fa3168cddad686cc56c3 SHA-1: 48ebfb84bcde539257f075f0c2f26f19e440a36d SHA-256: 6270ebe090b1ef6f96042f50ca77f9ae8f73847f28a1d8936086a701de2e2c23
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be search engine optimization related content, as indicated by the embedded URL targeting 'stihl ms 250 cost new'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wb?keyword=stihl%20ms%20250%20cost%20new PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6014b15d82e64.pdfIn PDF document text
    • https://rifedisivivuze.weebly.com/uploads/1/3/2/8/132814279/vujamuwizalup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fc8d987c8a45.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/2275005.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/27c035fde1f7.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/57cff8502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_5fd66e56db2bb.pdfIn PDF document text
    • http://koprovk.xyz/serenogevagaranirelovup2fq.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/gotapuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5ff8b826cd823.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/ad4e504e2cf4ff8.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/1390015.pdfIn PDF document text
    • http://originalhallyu.com/naruto_ultimate_ninja_apk0n3x8.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/wovigebi/82226670284.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/cow_eye_dissection_data_sheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/2353696318.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5324 bytes
SHA-256: ec8d9bce84970da19413a39ce00df66d926cfa8ba0f1ffe71c0f5b6b6d8fdfc8
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 12676 bytes
SHA-256: f9e84c617255646dc6e324ffc3fd9c3a1e221e7fa0357e73c247d5c589295ccf

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