Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f975ee9ff186d4…

MALICIOUS

PDF

83.2 KB Created: 2021-07-13 15:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 658a9b63307b87821ae4075901aa1e5d SHA-1: 3a68caeeb5ca7783ce197c7ab694baeacd107291 SHA-256: 65f975ee9ff186d4bbb56a20539d852cd28aa258d37e6392fe016650f958a85b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate the presence of external URIs within the PDF document, suggesting a potential phishing or download lure. The PDF structure also shows duplicate object bodies, which can be used to obfuscate malicious content. No scripts were extracted, and the document body was truncated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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=bodyweight+squats+for+mass
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec86db3a853d606aece7a5/1626113755726/buvis.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7d76ebab062161338491b/1625806702745/higher_education_foundation.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_off0000e4c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
font_01_sfnt_off0000fcdb.bin
5791fe737a02c7f46ae78bf2a5a0ba0cdd0abc10600e6c902a82c793ea81f50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 11148 bytes
font_02_sfnt_off00011687.bin
9fda42149485be0e677885aa6fe52e3450352e94f34e38b9300ff24f28381de7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 16644 bytes

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