Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f708b0e4c79bdbb…

MALICIOUS

PDF

74.0 KB Created: 2021-07-13 01:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d190d3295ea449fc5fea31e519df4b14 SHA-1: 04381d6b52b05d3dd87ca3c098d27990f8a8d69e SHA-256: 4f708b0e4c79bdbbf128d673444bb8e5db598e6b453fb51ad14d388f26867557
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded URLs and the wkhtmltopdf authoring application suggest it may be used for phishing or to deliver a second-stage payload. The obfuscated document body prevents a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=two+dolla+holla
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8bb3d5014d954a6661315/1625865021371/wisifazirukikejujevi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e946438fb24157da714626/1625900611975/what_is_the_story_the_lady_or_the_tiger_about.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb4f6a506f377f53707a1/1626125558266/energy_flow_in_food_chain_is_always_unidirectional_justify_this_statement.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecc5c0c403c01b632d83f8/1626129856382/square_ft_to_square_yards.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7ba1a1d61f435cef61eeb/1625799194608/mulan_famous_lines.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_off0000c0d0.bin
c205efc7c6d2f04a8eb75f583052d18a691efbe96163051b158cf8c593ac8f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D0 17212 bytes
font_01_sfnt_off0000edb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
font_02_sfnt_off000105c6.bin
82915337ff3cb7de5a9a72a6a0d09abbe485ad3393b6a725724429fe9571081b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 9700 bytes

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