Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f2795aa2a84d84…

MALICIOUS

PDF

90.9 KB Created: 2021-09-19 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cf323de9e9f9bf0331bfeb64b446d60 SHA-1: 69abd5c4ede5661ebe5c81aa14016b0db1ea8d68 SHA-256: 98f2795aa2a84d84685037734c64f1127354ac053014b8996235dc7422922894
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 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://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://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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

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
font_02_sfnt_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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