Malicious PDF — malware analysis report

Static analysis result for SHA-256 f709b1fb95889e44…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8771a450744d031b2119240b9b735ed SHA-1: 00fa397c8f27cf598854783909a170bde64f9c04 SHA-256: f709b1fb95889e4459824a28c7238ca9d74d6337ea530afea486a95889f89656
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive structure. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature suggest the document's primary purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

Heuristics 4

  • 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 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
  • 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://smidgel.ru/uplcv?utm_term=the+movie+kimetsu PDF link annotation
    • http://tion.hu/upload/file/bolabevesamojivokilov.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/voxaxijosafisabuxedusiwuw.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/14798596159.pdfIn PDF document text
    • http://katela.net/userData/board/file/16606192613.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/buferoduraj.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/gadijuvizetuvusojifaju.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/43572600603.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/zusotajetuvapasari.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rilupaxinat.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bubo9qvgmp93v3mup0arr0au9t/23022893698.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/zubaxo.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/rewolopuzudemun.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/vunobo.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/rowejibegedabugumofiv.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_7C71ED17890F72CE.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/948524226.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedameb.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/nadawigoserelijokenixur.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/xiwonanakalewolole.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/27996977066.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/xofopadu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wonumad.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 17476 bytes
SHA-256: f9e8d186e1235720a8f5067d3114f7bb885db5193f70e4eb206d16a284aef676
font_01_sfnt_off00012eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 10180 bytes
SHA-256: 5abce604b5ada0cb191c35842c5752a084e125b410ab3b0262592924eec90c8c

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