Malicious PDF — malware analysis report

Static analysis result for SHA-256 721c2d9a927a905a…

MALICIOUS

PDF

120.5 KB Created: 2023-02-28 11:33:17 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 0d081663aa9b1add48d5f28b0915e969 SHA-1: 2498c85ec0a773eb8d33a8b91449ae094ae2cc53 SHA-256: 721c2d9a927a905aed7752dce02075288b6a481b69141bb01a9cffd95976ab1f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains invisible links that direct the user to download a ZIP file from a provided URL, indicating a downloader pattern. The document body was unreadable, but the heuristics strongly suggest a malicious intent to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

Heuristics 4

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • ClamAV: Pdf.Downloader.Iceid-9992788-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Downloader.Iceid-9992788-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 120 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://firebasestorage.googleapis.com/v0/b/fourth-palisade-377705.appspot.com/o/FFvlqdgQLT%2FContract_02_28_Scan%23204.zip?alt=media&token=ce72e762-92a2-4f38-a4b0-0f87a2c5bead

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