Malicious PDF — malware analysis report

Static analysis result for SHA-256 84601c821a295d61…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 18:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f05a444169a762f9ee4a091abff19d7f SHA-1: 16ede5c75520bdfeccf099ae79a0dbb3430721a2 SHA-256: 84601c821a295d61c1fab998a279214005cc21a6c0a40771d0af0c83012fc5cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=3d+xxx+games+android PDF link annotation
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613329c1b33ba---jinozanava.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903210027554842.pdfIn PDF document text
    • http://zerosquareonline.com/file/gekopivigekatozozetewej.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/nitibogimimepufinor.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/vegiwo.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/94356495950.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/25198309380.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/nifoxidil.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/burusurewanadineteta.pdfIn PDF document text
    • https://vientangluc.com/upload/files/25257302343.pdfIn PDF document text
    • https://ever-progress.com/upload/files/giramiget.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/pelosasaririwitasowuvinoj.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/85801758138.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fijawuzal.pdfIn PDF document text
    • http://leeandrewdavison.com/download/jamijovibabedalo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fe54eca69541ee1ef13e079f2f6f8f3f/45652689348.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/tetugonavugenozolo.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/49310233564.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/59773800129.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210917_2392CEA446C54056.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/funusubas.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/25393508860.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/roxixik.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/letagebopomo.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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 16364 bytes
SHA-256: 12fe63ab6766c61010ebc720d36f1eace0e510e5a6f15327e15850c7ba370663
font_01_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 10624 bytes
SHA-256: bda91675967a21dfbd440c143a89ce9f4e498028d606e11e3f27e7c25644b44e
font_02_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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