Malicious PDF — malware analysis report

Static analysis result for SHA-256 733a84cbb2df4970…

MALICIOUS

PDF

77.5 KB Created: 2021-07-19 17:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52ca136b83765810527a562229db121e SHA-1: d83f0f714fc5b176ef7dfefa6ab1baacbebac930 SHA-256: 733a84cbb2df49704b2a6df8886569f7c754d4bf3393bd731d0f95fe4e6a17af
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 phishing or trojanized PDF. The presence of embedded URLs, though many are confirmed benign, suggests an attempt to direct users to malicious content. No scripts were extracted, limiting further analysis of specific behaviors.

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/uzX87CUNjRg/square?utm_term=quick+recovery+images
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8d2290a3fc495319ec7a/1626115362662/alloy_of_copper_and_zinc_is_called.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7f10cafd06e4982eb567f/1625813260560/only_a_northern_song_lyrics.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e788c5adf2c26882fb690e/1625786565560/lewis_dot_structure_maker.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_off0000cce0.bin
0e08a97fbd49e30756d6bda43161fd6f3ad791a0be75623abc9f6f67456ff0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 17032 bytes
font_01_sfnt_off0000f99d.bin
f3f3aa64d71a2b269275de2f90bd6f15e0fd0a9fb2e762b8a74d5aeb81d387d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 10756 bytes
font_02_sfnt_off0001128c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 16792 bytes

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