Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3adfc626dc1fdee…

MALICIOUS

PDF

76.5 KB Created: 2021-07-17 01:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57f1b3c1963c71d143479bddfa88ca41 SHA-1: 2fb276159875c40f7634cd6177e1b7fc4470c013 SHA-256: c3adfc626dc1fdee3a65d06780f6a1c749ed98c65170a2112539c2796e6533d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing trojan. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to lure the user to external resources. The file's structure and heuristic firings point towards a malicious PDF, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/~3/1LSSs5qy-i4/square?utm_term=65+cm+to+ft
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f08e6b90d93f669ac94e35/1626377835662/98518897404.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0b828625deb121688cd12/1626388520524/alcohol_carboxylic_acid_ester.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec83e54c0b954f9ea4228a/1626112998054/pemazut.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e867c4f244fe436816cf75/1625843652681/outer_knee_pain.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee2a41f72ce0266e0e8c2e/1626221121893/jailbreak_ipod_touch_4_without_computer.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_off0000c9e3.bin
c84da946f4ea464478481b15d7e0b340f515dbdb2e71bdd9f498f8cacd5462d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 17568 bytes
font_01_sfnt_off0000f74c.bin
78a826d72df88fc02fb110ab22643e7f0285f030e6fe3bd77cfa3f5e39676baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 9896 bytes
font_02_sfnt_off00010d2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 16792 bytes

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