Malicious PDF — malware analysis report

Static analysis result for SHA-256 1301f0f811783cb2…

MALICIOUS

PDF

47.7 KB Created: 2021-09-25 20:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7be4ed4eba7b07a37be914921829d4d8 SHA-1: 50064e5bd5fed28250195fb6c5d262ad3d14c752 SHA-256: 1301f0f811783cb2a3f28e59814e297ccaeb46169c0eb19a6d35398aa50657be
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=messenger+android+2.3 PDF link annotation
    • https://dailyiat.com/html_upload/file/61880305051.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/91500513879.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/bupomekuxowebikamefuz.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/13943191851.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/37725861795.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/90806411112.pdfIn PDF document text
    • https://attack.lt/images/files/78984792628.pdfIn PDF document text
    • http://888chji.com/userfiles/files/6821713082.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3deb5e53a2899b7a031dad9251b6af29/88336696154.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/zinoxepufukupevek.pdfIn PDF document text
    • http://okvin.org/userfiles/file/55618960166.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/fesusebubugutezab.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/36782288840.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/59411198734.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/29276052786.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/28661577342.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/65043419282.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16231728443.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/wemarabigevimuwamewavup.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/bumomobixevirijisiwa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb54c28e9---melajonu.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/57010178040.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/63558303450.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/121430292.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/pufijoxiwiju.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zomokapovobij.pdfIn PDF document text

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