IcedID — PDF malware analysis

Static analysis result for SHA-256 d8dc4ec4e00170f6…

MALICIOUS

PDF

76.2 KB Created: 2023-01-09 08:21:59 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: d6526ab8d79422cd64879b2c18765378 SHA-1: bbcfda662b64c09ed5de6f26f9481fdc438a8695 SHA-256: d8dc4ec4e00170f66c75037b9b490b70df58ee11edc6d9451f11f021cb19b162
170 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF is identified as malicious by ClamAV and a machine learning classifier, with heuristics indicating it's an image-only lure designed to trick users into clicking invisible links. These links lead to a payload hosted on Google Firebase Storage, consistent with IcedID's typical delivery methods. The primary attack vector involves embedding malicious links within the document that, when clicked, initiate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9052

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.Trojan.IcedID-9983378-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Trojan.IcedID-9983378-0
  • 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 76 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/ace-botany-372414.appspot.com/o/mFJrVJWaPg%2FInv_134_Jan-01_Copy.zip?alt=media&token=0d92b394-818e-41e3-9bf7-3745df01e9e0
    • http://www.iec.ch

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
icc_00_off00000059.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x59 3144 bytes

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