Malicious PDF — malware analysis report

Static analysis result for SHA-256 b608c70a3be47c2e…

MALICIOUS

PDF

76.2 KB Created: 2021-07-12 20:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66ce979a4be393e98fdfef947c2596bb SHA-1: 256b0215cea454cff87e4435d45212a4e6ab86f7 SHA-256: b608c70a3be47c2e0fc8f3aa28bc92de9688f95243754d7998b90564a5c96137
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. While no scripts were extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect the user to external content, likely for malicious purposes such as credential harvesting or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://feedproxy.google.com/~r/sq/ugae/~3/-MXWpcYQ7kA/square?utm_term=sony+bdp+bx510+manual
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec71a4d0153e73bf89fc35/1626108325104/dulebojivifu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74b.bin
0b30bb91ebd7278fd87634f2335ad8862e1577b11f1cfce119f0d25ac12db6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 10800 bytes
font_01_sfnt_off0000e000.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16792 bytes
font_02_sfnt_off0000f812.bin
13ce9d38ea10ee6a99ce0a74a3f99219a9b4a42464217b2a914a32543f2724de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16756 bytes

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