Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cad36c75139f8b9…

MALICIOUS

PDF

63.7 KB Created: 2021-10-08 08:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1a5c878d0fbce69a969524a37ffbe44 SHA-1: bfa77ce32954c07e1262e1f6e72789fcf423f448 SHA-256: 8cad36c75139f8b967c9fffc4a93f8892346763cc4eeb8aad6f9949dfcb45d9e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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://olympicwroclaw.pl/zdjecia/fck/file/51238337764.pdf In PDF document text
    • http://nousgarage.com/userfiles/file/sosar.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/mifexowufarejup.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/64121072556.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/burubuzu.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210908021610.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/vobagaxudifutinujazat.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/lixupetiwazopikowonud.pdfIn PDF document text
    • http://fteq.ru/files/file/dimenajesitajape.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/50838495714.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/90244072620.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dodutedem.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/60321680671.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/vavus.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/wimusise.pdfIn PDF document text
    • https://senfina.top/uploads/files/pukemiwefuj.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/83084490946.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615afd2463074---zatajozepirekafabuzin.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/35996707011.pdfIn PDF document text
    • http://goldmustang.ru/files/files/68215445342.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dubupum.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03a407af3---14118198855.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/48668399551.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/37491708084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fun+facts+about+reading+habitsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10928 bytes
SHA-256: d268b5d39f70696408b58a690e21f9ebca93e7f2d5571514d42727e3eb4e48c2

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