Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2b4f898639d843…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 10:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 803ddb958c6e062c4d17b58e4d7e0c09 SHA-1: fbd1159f618c7a053f70f3891506a5407941c82e SHA-256: af2b4f898639d843d447962f4b6cdcba8b07668b6b610626d56aee1f1133414c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of these URLs suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5802

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://pistant.ru/uplcv?utm_term=business+adventures+by+john+brooks+pdf
    • http://kunbot.com/upload/files/mesopomebexaxujuwobalos.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bf114f63a209d11df6fb68185fb0754f/48601499529.pdf
    • http://studiomarcheluzzo.it/userfiles/files/purav.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/mibatubigexax.pdf
    • http://firsttimehomebuyerstudy.com/images/file/birasujetu.pdf
    • http://lamorenj.com/userfiles/file/zolobimudulokogexuvijix.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/14009301616.pdf
    • https://zohopin.com/calisma2/files/uploads/44119951477.pdf
    • https://crbz.ru/userfiles/file/keferofexejivalex.pdf
    • http://creative-format.com/upload/editor/files/zepifipojotulu.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/71772587590.pdf
    • http://staractivecollection.com/resimler/site/files/35151284877.pdf
    • https://dabanbep.tanglehadong.com/upload/files/62694019786.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/tifijewum.pdf
    • https://eko-briketes.lv/userfiles/files/51247524270.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb7df0f2e---73848116397.pdf
    • https://riolisboa.com/images/ul_files/file/wKmuRZfgQlBW.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/78593290901.pdf
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/buxuto.pdf
    • http://caratow.nl/userfiles/file/lafutisar.pdf
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/texukolozakurufizos.pdf
    • https://anakmeong.com/contents/files/35042105247.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/77830592515.pdf

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