Malicious PDF — malware analysis report

Static analysis result for SHA-256 340b9ebcb7f0df44…

MALICIOUS

PDF

37.3 KB Created: 2021-10-05 14:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f9c8d6e52ce5f5ad145dfd042e54e9b SHA-1: b553f59677fe4c56acdcfea9d1172dd741f78793 SHA-256: 340b9ebcb7f0df44770d5e890f6d73c081ca0650b52f64867e560cc0b671faca
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple external URLs, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely uses a screenshot to hide a clickable element, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=exam+questions+and+answers+pdf PDF link annotation
    • http://fitsiluet.cz/data/file/tafeninugebutope.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-10-4/20211004005329389020.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nebijaxinoxeboba.pdfIn PDF document text
    • https://el-tall.pl/pics/file/xamepaludekowigogat.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dekobigebiji.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/65835791673.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/19121657294.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xazopamipinodabized.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/76755411035.pdfIn PDF document text

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