Malicious PDF — malware analysis report

Static analysis result for SHA-256 1738e1285aa1efba…

MALICIOUS

PDF

62.3 KB Created: 2021-10-06 22:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1ef0842585dd5b85d0a0e90571ddb63 SHA-1: 331d59fd770a03270cff77dea13d91d3a6c7bd4c SHA-256: 1738e1285aa1efba684f8b8908cb3793fa969eb69c52c3b5b9c60ec8d3bf2dd4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, indicating it functions as a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8029

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=carrion+how+to+get+to+nuclear+power+plant PDF link annotation
    • http://vietkinggroup.com/uploads/userfiles/file/42205116288.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109071350393760.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/robivigakikatedenet.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615d736b15522---nomubebaritiwevuxop.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/43057474323.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/xorafipo.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/71471178309.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/60301593209.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/79022454477.pdfIn PDF document text
    • http://robedecreateur.com/img/files/20463009292.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/mowiruwurulupeta.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/fegatonoku.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/39341772920.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/bulowapaputukedenubezaw.pdfIn PDF document text
    • https://fptica.ru/images/file/sasefijipedojazozelib.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/wanaboni.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/28804316397.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/20073141101.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/vixuxuzinudadusiwu.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/39976216648.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/sakilimudulos.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/gemiz.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nanadolapufowilul.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e5168101c---zuviritule.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/92039395004.pdfIn PDF document text
    • http://land89.com/ckupload/files/livep.pdfIn PDF document text

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