Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a9881f5455e12a…

MALICIOUS

PDF

60.9 KB Created: 2021-10-17 17:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 087eabc23902c0e5fc4e2ce85b0985d5 SHA-1: fdf01da50e9bf5d6e65baa49eb2a8c314cd59e8a SHA-256: 64a9881f5455e12a057d379dcb3a6071c1496f7679f6886ab4e7009572c2edeb
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6618

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 https://queure.ru/uplcv?utm_term=conversion+of+kelvin+to+degree+celsius PDF link annotation
    • http://vpsystem.com/files/fck/73950322922.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/98076946943.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/zadasadutekin.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/65340030204.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/tomuzesexezarabufer.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/46855743800.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/85901001777.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tovina.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/giretigukalixe.pdfIn PDF document text
    • http://homeopathyhk.com/files/mimofomo.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/malarusoguwajufiwu.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/71411235578.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/37984039304.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/69972403952.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/nubikilujewikafodekutuzin.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/68537443434.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/74785867532.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/32714698850.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/79966859459.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/72856501923.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/pewesigezanitosot.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161518ebac439f---70451903390.pdfIn PDF document text

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