IcedID — PDF malware analysis

Static analysis result for SHA-256 7f5864e2fafc9c7c…

MALICIOUS

PDF

54.7 KB Created: 2023-01-17 06:37:39 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 93a25f911c3052aacd13f6720c0d7ae1 SHA-1: a3b677e03bbb4e3fafbe3b0fcc151144b4ce986d SHA-256: 7f5864e2fafc9c7cadafbd0cb763c284f4fa15d0fcdd713984f094cb0dd0a15a
170 Risk Score

Malware Insights

IcedID · confidence 95%

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

The PDF is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's an image-based lure with repeated, invisible links pointing to a payload. The primary malicious URL is `https://firebasestorage.googleapis.com/v0/b/robust-metrics-372417.appspot.com/o/Nf6xXtCw8X%2FScan_Docs_01-17%23278.zip?alt=media&token=3be89722-38e2-4ad5-bc1c-d372e8fb1e0d`, which delivers a ZIP archive. This delivery mechanism is consistent with IcedID banking trojan campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9085

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 54 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/robust-metrics-372417.appspot.com/o/Nf6xXtCw8X%2FScan_Docs_01-17%23278.zip?alt=media&token=3be89722-38e2-4ad5-bc1c-d372e8fb1e0d
    • 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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