Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a264ed079721195…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 21:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 521066a6c550f92b92163c8b19ab9984 SHA-1: cfcb7b0b09f559839d3294e31f693b055442fd81 SHA-256: 6a264ed079721195fed6d41783150ffd7a3725d8c0b8961497468ffb01c624c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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 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://huntic.ru/uplcv?utm_term=mortal+kombat+vs+dc+universe+download+for+android PDF link annotation
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/8941967638.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/44585784134.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/nupiza.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kikutet.pdfIn PDF document text
    • http://jck.ro/userfiles/file/xapapusodufirakuri.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090315242573499.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/67880596594.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/58568382543.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/53988459625.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/8329937415.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210905_215230.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/karubolapufozotubivopudo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b33caaeaaafc98d826c84acd2b211442/solovino.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sasonawivivisakodiso.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/60597119991.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/depujozikurekaf.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/narebozimelikugejugabotez.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614001f6dde38---xurabafobutonil.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/lelizosowipadezotiju.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/pilodumam.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gesepobajabamenezezovisu.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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 19036 bytes
SHA-256: 0982245277cb73360ce6c7440b8b20b13bc2072d0ac0aba0dd9bed0b32118a29
font_01_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 11112 bytes
SHA-256: afa4d7606b65e7299af0b04fd63cd562cc8d600d91875ede624ab8265bd7a6c0
font_02_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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