Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf16e0f2022a9d1…

MALICIOUS

PDF

59.2 KB Created: 2021-09-15 18:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ae6c116b1031f38311fe1353b8a98f6 SHA-1: ef32ae151e108608b63c1b1f3e35fad476d44337 SHA-256: 0cf16e0f2022a9d16eb00231f6243cb4b02d552b79e2d784b2fc147ff4142b3a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5307

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.
  • 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://coretry.ru/uplcv?utm_term=download+photos+from+android+phone+to+computer PDF link annotation
    • http://epmachine.ru/d/files/lerujujigujole.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/49587804102.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/49880622398.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210906_67940212F3A7378D.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/wuwuviwunuruwale.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/94026433498.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/gunisematezap.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/demezexavupilepavim.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210914_6AE556484E1BDD14.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/kalavuzamiwalamala.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/3453161646.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kofozejolab.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613755e6d5857---1344465834.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tijiwiduwafeguk.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/fuzurijagegetasomenaluvef.pdfIn PDF document text
    • https://kultmotor.hu/images/files/73870543412.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/96147850936.pdfIn PDF document text
    • https://nasikampung.info/contents/files/nipavexe.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/82446141734.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/mopinewila.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/86687066898.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/13748947444.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mivasopejenefaf.pdfIn PDF document text

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