Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1dec09daaccfb9…

MALICIOUS

PDF

76.8 KB Created: 2021-07-18 00:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb5cbaa5945d3de5bf9fbf09a990df6 SHA-1: 1b821026af5926cdd2e9b298e4ca4abaf5c710d9 SHA-256: 2c1dec09daaccfb9d4c52e41decda01ea3a26766950908295506d49523bf0d3d
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of embedded URLs, although many are marked as benign, suggests a potential vector for delivering malicious content or redirecting users. The file's structure also shows duplicate object bodies, which can be an obfuscation technique used by malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/cEZ-xJcQpFE/square?utm_term=what+we+call+a+group+of+sheep
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1bf76638320257083ece1/1626455926501/electrical_safety_standards.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f09ce3f3688006ea62abae/1626381539803/the_magic_of_the_lost_temple_download.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_off0000cb8d.bin
b521d35c31d74e3a692ea067067e304c9bdddc87d6c6219eac1ab70cb56ae6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 16480 bytes
font_01_sfnt_off0000f671.bin
58291d0ec5362e4a7a483ac2c310017f7cd5816ed3544d0d509a0f0a0de00fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 10740 bytes
font_02_sfnt_off00010f6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 16792 bytes

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