Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef3afcc22bcad1d…

MALICIOUS

PDF

70.8 KB Created: 2021-04-17 14:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c808fedebcf81c03dde13d2bcab5a024 SHA-1: abdc5dc3c123c1a91568c89028afea5cf61fc9ed SHA-256: 8ef3afcc22bcad1d742c1e2fece3d0283d8fd0d951ec52a23ffd892a1eed0d6b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm. The primary URL, 'https://gimoguvi.ru/strik?utm_term=how+to+connect+surround+sound+speakers+to+lg+tv', suggests a lure to a topic that could be used for phishing or to redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://gimoguvi.ru/strik?utm_term=how+to+connect+surround+sound+speakers+to+lg+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457312/normal_602d6484dc902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_604b9519c9938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_602fde716e73c.pdfIn PDF document text
    • https://pazibeze.weebly.com/uploads/1/3/1/6/131636707/e34d2d3e2.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/5425070.pdfIn PDF document text
    • https://falojixij.weebly.com/uploads/1/3/4/8/134878909/5718072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5ff1b8ccc3d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_6054cfae0f194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461744/normal_5ff17c56a860b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fe5043abae28.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/c95254b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_6000164b99562.pdfIn PDF document text
    • https://megogira.weebly.com/uploads/1/3/4/5/134590171/pikosejigajonuz.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/susonanezaj/organization_chart_powerpoint_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/dudukiliwenetakogazeb.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 5416 bytes
SHA-256: a634e9f461fa0649d8067951814e27a6a0888c5b7376bf85e7b02409656a3234
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 10456 bytes
SHA-256: bef9f119329768cc47a445dec22d14a0cfc2aa67668716f8418ed4c3b57c088f

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