Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cbb8194e4fad7d…

MALICIOUS

PDF

21.9 KB Created: 2023-03-01 12:40:52 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 88b114a6d58a56320607c7d23e219b4d SHA-1: 18dce0565fb1dc14965bf598b27deced67df29d1 SHA-256: b2cbb8194e4fad7d943d4cec9899d6a3acf82e4f67ec69875d85a1b01cd7f899
170 Risk Score

Malware Insights

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

The PDF file is identified as a malicious downloader by ClamAV and exhibits characteristics of a phishing lure, including an image-only presentation and hidden clickable links. These links direct to a ZIP archive hosted on Google Firebase Storage, which is likely the payload. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8794

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-9992787-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Downloader.Iceid-9992787-0
  • 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 21 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/inner-precept-377707.appspot.com/o/MTu2hQvVbu%2FInvoice_Mar_01_Scan%23150.zip?alt=media&token=f0cf7160-de6b-4d8d-bd70-8fcd1e8d0b29

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
icc_00_off00000058.icc
43cdd2889d7e967a70e3688e45dc50c2f596288a4356b41234d247bbb69d5f30		 pdf-icc-profile PDF ICC profile at offset 0x58 456 bytes

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