Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a60a3e99282cb0…

MALICIOUS

PDF

76.6 KB Created: 2021-07-15 21:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 895a21aa3dbc94e7931a9d108e02d206 SHA-1: 911055fa03a9a6de3e3fa929f1894830bf8a026c SHA-256: c5a60a3e99282cb0773a2ad9bdd03f61d63bd8e1539e6ff8daef602d803a7c1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The PDF structure and heuristics indicate it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/razvivatel/yapz/~3/AG-UZpNbJGc/square?utm_term=how+to+write+a+journal+article+for+publication+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f06dac98e33d2cebbdb98a/1626369452975/nujakutajipe.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efdc5724fa75375d83581e/1626332247965/my_mad_fat_diary.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee39a47426fb5109f46c9f/1626225060903/wogixivujepelazipofus.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0434be00eb31d7cf13637/1626358603776/meaning_of_propagation_in_physics.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_off0000cbe8.bin
ba85147a14e97821b7c4b8593284632a3758ca8e0634274870c5d3e38e1b9ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 15996 bytes
font_01_sfnt_off0000f510.bin
40302d84a7f26e11ff2d12fef964d265a28ab3f51435c240f51a8b8202b02c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 10892 bytes
font_02_sfnt_off00010e19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 16792 bytes

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