Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4243be65325f1a…

MALICIOUS

PDF

84.3 KB Created: 2021-07-13 07:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa718913be58088223640354b7005641 SHA-1: cb4067bf9e131d148cc1705e556088991b229f50 SHA-256: 2a4243be65325f1a5bf44a4fdff7941b21a64d160528d2dce6b44764242060a1
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 for Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall pattern points to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8440

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/nCRFBnYrBHY/square?utm_term=prism+and+pyramid+questions+pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a1bfefb14d11220df793/1625792959795/binorufewu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec92321951226b8b8bf865/1626116658712/wolf_and_dog_playing.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a5d82b4c978cf40a80a/1626110557273/divisibility_rule_for_7_with_example.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec92687dc7460dd09c0bf6/1626116712671/not_an_exhaustive_list_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9561831aaf5e928bc9ec/1626117474143/segalazoluwapoxojunobovi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7c0f125441e1b3784c663/1625800945399/draw_on_paper_plate_on_head_game.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_off0000e330.bin
5944325ab37c1287776dc8f6d480aff8b9601402b67a8f9c259fd14d6ba70695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 18360 bytes
font_01_sfnt_off00011431.bin
a6aa5d62e26fe917c9ec2dd84af038f12671a35e8a6553b4549f205bc3f0450b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10976 bytes
font_02_sfnt_off00012d75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 16792 bytes

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