Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7e85bfe6953bc8…

MALICIOUS

PDF

38.9 KB Created: 2021-09-16 03:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bb0558340415bacff4bae92a769795b SHA-1: e43028c3ee6ea8a6bff4ee10ea5b192da7feefbf SHA-256: 3f7e85bfe6953bc82583db7b4133dbf76c4b42c2f71aebf5b9863eb317a687ff
152 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and is presented as an image-only document, a common lure technique to hide clickable links. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8662

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=vernost+2019+russian+movie+online PDF link annotation
    • https://togeltop.net/contents/files/5125357151.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/53698475083.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/miwobo.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/xotuvebadulor.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88811102710.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613320fa46fcd---11618992307.pdfIn PDF document text
    • http://12shio5.com/contents/files/jefopatewoxeru.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/54294187403.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94308ac09---botinutuvifufojimetosotig.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/77496382899.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/73681582990.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/38474521812.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210914073605.pdfIn PDF document text
    • https://terracell.pt/images/file/tuvinisawojusorezuteba.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/fugoxo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/pipadubifefiluluxapetos.pdfIn PDF document text

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