Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c520bdf898bd03…

MALICIOUS

PDF

41.4 KB Created: 2021-10-05 02:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 400dc153f67b9939761243729985528f SHA-1: 8c6a1c64e926730af65498686d6de4aca8fb6f86 SHA-256: 11c520bdf898bd03f1a9d690f849985eeba74043f2f27c8b1db270f0e2c30f0c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It leverages numerous external URIs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination, likely a phishing or malware delivery site. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9566

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 http://albachiara.info/userfiles/files/66363092509.pdf In PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/35532572876.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/retigufal.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/27733001730.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dejewa.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/17966217012.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///84445947557.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pabuzekalefomej.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xenovipolebijorixunumomi.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sadaloju.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b558b1e2fb---38072745748.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/92862188114.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/bexojozazudujebijigomu.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/71370913604.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/komupunevadixoxawiweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=purpose+of+cortisone+injectionPDF link annotation

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