Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fbf942b44fdfff…

MALICIOUS

PDF

72.2 KB Created: 2021-07-18 10:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed83f8eb6e4493bb5e30e11d84addbbf SHA-1: e256860545f917a0b4f23e6a45d77d52a4e99bc8 SHA-256: a5fbf942b44fdfff435eeb2710c82467933cc1cfc5d0a690208fde1501c5a73a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV. It contains heuristics indicating a fake invoice or payment lure, suggesting a phishing attempt. The embedded URL, although marked as benign in this analysis, is a common indicator for such attacks. No scripts were extracted, but the overall context points to a phishing lure designed to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier clean score 0.1869

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=scanned+invoice+pdf+download
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed2a064bcdcf6393fb3a78/1626155526510/83553435896.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e77d6e3b4ef55d90f9b599/1625783662395/babojenimujob.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_off0000bd21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD21 16792 bytes
font_01_sfnt_off0000d533.bin
6381f1e5e2adfb024efa86a46aa2ad209094101ee4a4341f2f58a9ab6b60cb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 15796 bytes
font_02_sfnt_off0000fd9b.bin
9b996cc67b5566ddfc1f9d7bb47fcaedffd7d36f5bda1947f786a7d7402495d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10472 bytes

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