Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e00ecf4dc4b677…

MALICIOUS

PDF

38.9 KB Created: 2021-09-15 15:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b24f4ff5cfa833c605ba07e45f4a7e80 SHA-1: 3d1dcbb94cde2d26001184cf8059707fd1a62513 SHA-256: 88e00ecf4dc4b677fc9e973eec477ddcbab9f34925d685bbed81fd8c90e4e270
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with an action trigger, typical for hiding clickable links. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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 38 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://cissud.com/uploads/ck_editor/files/gakipejixadazavaliduxi.pdf In PDF document text
    • http://meetburgerusa.com/uploads/files/fifelosawuweputu.pdfIn PDF document text
    • https://shevian.com/images/file/11410415979.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/konidukajunuji.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/45333982671.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///28267487085.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/8711698862.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/nivokawu.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/22921271627.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/dedikorafojab.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/67096489669.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/dixobadodi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b0ed547745bf74172b4e91d4961827f2/75863495615.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/7692713148.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/xamadejuvudefivokuwez.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/54224838882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bhojpuri+song+recording+studio+near+mePDF link annotation