Malicious PDF — malware analysis report

Static analysis result for SHA-256 4376fd505543c888…

MALICIOUS

PDF

96.9 KB Created: 2021-07-13 16:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fbca10bbee57399ce48e21355c95201 SHA-1: 5066c80cbdef87ceb89f5e30cbb3cb6315638e41 SHA-256: 4376fd505543c888131709928778d693a7cff200ac64a139130d68c808529241
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or exploit delivery mechanism. The PDF structure and the 'wkhtmltopdf' authoring application are consistent with documents used to exploit vulnerabilities or lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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/~3/5Aj-mlxkUx8/square?utm_term=temperature+thermal+energy+and+heat+answer+key
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed914a094bb21e9996d169/1626181962236/zunor.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed911f5eed834fcc386919/1626181920169/soligexivoli.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed806d36a7a57c1cf401d8/1626177645511/mountains_near_los_angeles.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec98d17b14134336de8294/1626118353893/domain_and_codomain_of_a_function.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ece4d9bde79631d3381f30/1626137817588/drawing_a_person_from_behind.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed175fc76d6b0ba00a3306/1626150752077/32062101617.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f6af2f3c4128e1885b74/1625880239809/meaning_nature_and_scope_of_public_administration.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec86d6d0153e73bf8c3216/1626113750428/which_type_of_roof.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7acbcba333063f175daeb/1625795772385/sasafezediped.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_off00011540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 16792 bytes
font_01_sfnt_off00012d52.bin
e870526ce5884ef377ee84f1b3fe0ef31c2ba0b658971d9a082137b79da353e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 18396 bytes
font_02_sfnt_off00015de3.bin
76c28d4e4284e7302982cd268b62b3c9d6725f05befe4d14a81049a27976c041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE3 10980 bytes

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