Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef762f3e4681852…

MALICIOUS

PDF

48.0 KB Created: 2021-09-13 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c077346568a892e90114bd62b896ae1 SHA-1: a4baf0f75b64187c46c563dca5f58ddb36ce9715 SHA-256: 8ef762f3e468185271cfb48f436c8fc73492568fcbcac0ebeceb7129b6049583
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true malicious destination by using many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

Heuristics 4

  • 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.
  • 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://chcial.ru/uplcv?utm_term=killapps+close+all+apps+running PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/xisilev.pdfIn PDF document text
    • http://unityproductions.com/upload/files/71664607808.pdfIn PDF document text
    • https://blugarden.eu/file/57684385508.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/23016974093.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/biwegotopevodowokir.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210913205225_u3gjsm.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/29909435102.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/denibe.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/33020268465.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/28316468770.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/5699272302.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/domasifiviwidevegukefofag.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/61609050319.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/52671454730.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e733d32548---vomeverifiwuz.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/nabajoxutigujut.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/47540873604.pdfIn PDF document text
    • http://wwstationery.com/files/file/tozowiwavojeja.pdfIn PDF document text
    • http://masonhn.com/d/files/sofupakuxaraduma.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/68345862872.pdfIn PDF document text
    • http://samtle.net/ckupload/files/deluxagugivufejumivakopol.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/gisisusivutawi.pdfIn PDF document text
    • https://dafelia.com/files/30024021605.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e689a6476b---8844755329.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/41575260031.pdfIn PDF document text