Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1217bb5e1273ff8…

MALICIOUS

PDF

46.8 KB Created: 2021-09-21 12:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21808f0fcc69dc41255801b7166dabb2 SHA-1: d973475fc1e6b2fda090cff65503e14907e10677 SHA-256: a1217bb5e1273ff8876b080a927e4fb57c42e3a9d339f7f5b10fb8a3d293f2d2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, and a specific heuristic identified it as a link farm on disposable hosting. These findings suggest the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6918

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://infrive.ru/uplcv?utm_term=learning+objectives+bloom%27s+taxonomy+verbs PDF link annotation
    • http://ascensionchina.com/userfiles/file/82877661820.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/dotarutadaw.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/nabiti.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/64445371869.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/bedojezirudifeg.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/80823115706.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb0c99f12---kuwuzovobuxuzemugu.pdfIn PDF document text
    • http://slsnn.ru/content/files/kivazewavomugevolerixikis.pdfIn PDF document text

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