Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c604b14fc9b741…

MALICIOUS

PDF

101.5 KB Created: 2021-09-16 00:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8ebe248fe034b386e675320cbf73b9f SHA-1: 861abc49814b4b72a968db44d013af0a0df5ea25 SHA-256: c8c604b14fc9b7411a301432bcc2ef82b71176acf93a685f1d400c0b199c0ff6
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, likely to obscure the true malicious destination. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8090

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 http://victoryelectricalsupply.com/ckfinder/userfiles/files/39804774133.pdf In PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912044351.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909125218_1671518772.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/43112817058.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/40771102858.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/nixolaxefis.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/kejew.pdfIn PDF document text
    • http://blueyee.com/upload/file/160503068185.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/gajesekikibopoposirige.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jupuvudega.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/fofujit.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613527209d81e---42310074084.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/3150641544.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/lisevuwenomabix.pdfIn PDF document text
    • https://xn--80aaa1anaIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=business+laws+and+regulations+de+leon+pdfPDF link annotation

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