Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d44dbc6fcd1617…

MALICIOUS

PDF

76.3 KB Created: 2021-06-10 20:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 036c23140babbca3960883307715bafb SHA-1: 463342d321c1f456ebd4c85a3b849b5565914766 SHA-256: 83d44dbc6fcd1617a10dfaff260208aea7942931f1c4c911e299f09e377aecac
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 hosted on disposable domains, characteristic of a link farm. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate this is likely a lure to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://catamma.ru/pbw?utm_term=htp+interpretation+pdf PDF link annotation
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/lolapekogew.pdfIn PDF document text
    • https://gosinixubog.weebly.com/uploads/1/3/4/8/134875818/13e274f.pdfIn PDF document text
    • https://zopavuro.weebly.com/uploads/1/3/4/5/134584556/db56d96a50.pdfIn PDF document text
    • https://siluvarug.weebly.com/uploads/1/3/4/4/134466410/zawelalowewab.pdfIn PDF document text
    • https://bugajexovul.weebly.com/uploads/1/3/3/9/133997498/sosujezovarisel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_604b8f9335212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fef46a4b4f9e.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/vupexesoroni-labijobenox.pdfIn PDF document text
    • https://volatofe.weebly.com/uploads/1/3/4/4/134442598/xiboxasidezixa_vinikadaz_mobewogefok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_5fde2d110e513.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/4248758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_6003c4834598d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_6045bffbb94a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_60359b7797bde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144518016/home_alone_macaulay_culkin_then_and_now.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144706635/windows_10_wont_detect_second_monitor_after_update.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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 4784 bytes
SHA-256: 5c662ae5b15022746402322acf9614400cb97f652abbf9ed60053a7a4eae34e8
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 11172 bytes
SHA-256: 311a65f75ff35aab8cfc43aa7a3b35ce517fb628786566d18522d23fdf65f0c9

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