Malicious PDF — malware analysis report

Static analysis result for SHA-256 318768e14341dcdd…

MALICIOUS

PDF

79.6 KB Created: 2021-07-13 02:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef41c2eabd65f59497f41ae0f2a0276a SHA-1: 6f4ad179fbc01aa9fcfafff78a48ca5f83a5bd6e SHA-256: 318768e14341dcddf2eea606a90628693aa7bf7fc978abe1f8bbfd1ab034f7e8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL that leads to a suspicious domain, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, likely contains the lure to encourage users to click the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/square?utm_term=the+essentials+of+computer+organization+and+architecture+3rd+edition
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7ab27a1add4dee1eb984/1626110642209/94047166952.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecccb5c4f5a641a5a49ccf/1626131637503/what_is_a_nonrenewable_resource_definition.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7c4d669e16759cf74a28e/1625801942184/breast_metastasis_to_lung.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8f4332f3c4128e1883956/1625879603944/what_is_endothermic_energy.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8d5d60c78bb021218dde4/1625871830797/doxopix.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8a54a2d98337f05e1fedc/1625859402771/67263703903.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_off0000d21a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 16792 bytes
font_01_sfnt_off0000ea2c.bin
7f204d663fee0bbd4de2c6243e8a4d4f2527a50e4adc77028b84e60c25419f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 17332 bytes
font_02_sfnt_off0001175d.bin
426afd99455d2c9e036ee1b24e30bd55c29cc3a7902bf1c48c4b0fef9559eff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 11364 bytes

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