Malicious PDF — malware analysis report

Static analysis result for SHA-256 b561fbe5486b9693…

MALICIOUS

PDF

77.1 KB Created: 2021-07-15 19:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f426a12a4b9e48060ae4bb7e310631b3 SHA-1: 10446294a12c56dfc59bc6a67c069174aff030db SHA-256: b561fbe5486b9693d5d61794fcab03372d5f4ccb876480c56c6f8b236c102183
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, suggesting it is a phishing attempt. The presence of external URIs within the PDF structure further supports this, indicating a potential lure to a malicious site. No scripts were extracted, and the document body was truncated, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/iXsW93xxTQA/square?utm_term=ra+in+elbow
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e841c074ba94069847734d/1625833920580/jejiwifeme.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efea574063550b157b5adf/1626335832146/79503092640.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda0cc9a9df7051d3f8f61/1626185932742/panel_discussion_ppt.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_off0000d1a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 16792 bytes
font_01_sfnt_off0000e9b9.bin
bea6dc748aaaf3763b956d296ca0861ffb3007bdd58626daf4f844ae9e2afc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 15936 bytes
font_02_sfnt_off000112dd.bin
1cfaca6b81ec6c990651ebbeda7ff935bf2bd07b29f4d73b231b70ce03e08aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10004 bytes

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