Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc6cae1f3dd1db5…

MALICIOUS

PDF

67.2 KB Created: 2021-09-08 17:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a3083d9ccdec1955ae0dded9e1b968f SHA-1: 6a7c417a2f62ab2c63d48bd905d3b122910b8f59 SHA-256: cfc6cae1f3dd1db568f8c4811ee2a92d3b82dff6e68dd78ee8a6d39cc0544def
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The PDF was also flagged as a link farm on disposable hosting, with numerous links pointing to unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7736

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bscsaoner.in/ckfinder/userfiles/files/33525369845.pdf In PDF document text
    • http://rklatex.com/userfiles/file/50648297452.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908045218.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/23291749027.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/50815380313.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/lonesaduromami.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061651084960.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/luditalepexafexofu.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/11181610402.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/rudinajatumido.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/12037051110.pdfIn PDF document text
    • http://grimastone.ru/files/zovofemi.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/lelunotasa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134240138ed7---77374671878.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/guvubo.pdfIn PDF document text
    • http://newmob.it/userfiles/files/63547368036.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/45820085491.pdfIn PDF document text
    • http://getem.eu/files/file/nutomor.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/92629342097.pdfIn PDF document text
    • http://zenithmetals.com/files/donigojomazafed.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/52419620081.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/texajuda.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xilikabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=guerrilla+tacos+cookbook+pdfPDF 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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 18436 bytes
SHA-256: 07ebac96683859a7d0be16b684f75640290b3db657415b654ab89a891515adf8

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