Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e7b381a0730f15…

MALICIOUS

PDF

22.1 KB Created: 2023-03-01 12:52:19 -08:00 Authoring application: iTextSharp’ 5.5.13.2 ©2000-2020 iText Group NV (AGPL-version)
MD5: 7fd5d97bce503138c1c0faf36692d3f6 SHA-1: e4c0a10d28157a0576f775c5aeef93de402248aa SHA-256: 48e7b381a0730f15ab541ebb7d50c53e03db86c7634fafbd7a0f4c968c73e977
170 Risk Score

Malware Insights

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

The PDF file is detected as a downloader by ClamAV and exhibits characteristics of a phishing lure, including an image-only presentation and hidden links. The primary heuristic indicates that these invisible links repeatedly point to a URL which likely serves a payload, identified as a ZIP archive.

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 22 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/tranquil-wave-377700.appspot.com/o/9fF8i9i7wv%2FInvoice_Mar_01_Scan%23223.zip?alt=media&token=47ac61ad-0c93-4b67-991d-86952361d6e5

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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