Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d2298f6a5317b3…

MALICIOUS

PDF

78.1 KB Created: 2021-07-16 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9ef76941d1f99399cf93e6bd1aee1c4 SHA-1: e206c11aded3e5a0220ce6882b4849c1d0c13ab8 SHA-256: c4d2298f6a5317b34b0e3ed1f240810535c4f1376b3135c56276807e54454bab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The obfuscated document body and the nature of wkhtmltopdf authorship point towards a crafted malicious document, likely intended to exploit PDF vulnerabilities or trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/~3/5JeRQhMeIYg/square?utm_term=how+to+add+windows+to+a+chromebook
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0f82f9392da325e94737e/1626404911295/accounting_of_process_costing.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93ebcb10b9b33fa98a139/1625898684470/monofolukina.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7b61e7e45264421f6ccc0/1625798174182/nickel_and_dime_website.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a5a82b4c978cf40a7ff/1626110554807/mighty_med_season_1_episode_22.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_off0000d00f.bin
427de6108a956abfe4bc04dc57e8d3564c2644f332b2e049a486362d0583b79c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 10900 bytes
font_01_sfnt_off0000e91c.bin
10100dbec19f5f1254d6730f50859319515b6f4a7b1558f7fbfde054bbd4b428		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 16860 bytes
font_02_sfnt_off000114b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 16792 bytes

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