Malicious PDF — malware analysis report

Static analysis result for SHA-256 715503ad6a8d2038…

MALICIOUS

PDF

73.3 KB Created: 2021-07-20 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7b5aabfa03f0413325294bd42bdd662 SHA-1: 55faf1abc88c9d3deff3ab394dde6efd4206dd12 SHA-256: 715503ad6a8d203809e27a10865d643b939ef9e8b8fa6320f03c7de20e1cee41
66 Risk Score

Malware Insights

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

The ClamAV detection and the presence of embedded URLs strongly indicate malicious intent, likely for phishing or delivering a trojan. The PDF structure itself contains duplicate objects, which can be a technique used to evade detection or embed malicious content. The embedded URLs, though some are marked benign, are often used as part of a malicious chain.

Machine Learning

  • Nyx PDF Classifier clean score 0.1797

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/k6oGaauGqGM/square?utm_term=sunnyvale+ca+to+los+angeles+ca
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e878ae228db43b00a25fde/1625847982918/zutow.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f28f9cdeec58162026db7d/1626509212933/strive_to_do.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_off0000be69.bin
a7114b273294bcb4b28995139457061269f3562b65ab15f0057c54f8101e5f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 10568 bytes
font_01_sfnt_off0000d6c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 16792 bytes
font_02_sfnt_off0000eed8.bin
0e5e06aaec3dbcf2e36aa699a2f63bf7e158e3c2b36456e10820e1994cf159cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16472 bytes

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