Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76114e50d246a65…

MALICIOUS

PDF

76.5 KB Created: 2021-10-14 10:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50649276fd9db72a65f0f6e2ec99c312 SHA-1: 3525e8cfb85cb24a5dceb40081f95195eae8406f SHA-256: c76114e50d246a656c3aba42cd26c61fbcaf1510f5d5981788bac72e34dfb3e5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely SEO poisoning or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6300

Heuristics 4

  • 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
  • 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 http://filtrydokoparek.pl/img/all/86531866402.pdf In PDF document text
    • http://foodzipo.com/uploads/userfiles/files/50375958148.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/logixugezonizagasowipoxo.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/napixulesumomatefu.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/78978175588.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/muforotizupemi.pdfIn PDF document text
    • http://irths.com/upload_files/files/burojoxebubuweladebigi.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/ruvoxete.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xuraxeweranevo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6aecfa5c6e53b5b1b40885c10baddba0/97550134047.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zuruxav.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/tutenipu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/50405572275.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/jigukamowakagupobajan.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/vanofivukuremi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165127ac362d---15487196142.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/26174104964.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/89252604836.pdfIn PDF document text
    • https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/nutoxira.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jivodivegulezada.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163111969763.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=critical+value+calculator+with+mean+and+standard+deviationPDF link annotation
    • 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_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 19520 bytes
SHA-256: 67cbdd42081ad7e8c0fc8a2038c173d870b9588611d4b25de715e89d891e0198
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 10916 bytes
SHA-256: 11960a83edfdf572630d7fea329b9536269afbaf4457cdfd24609a505f352df8

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