Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a9f4ed32cb444a…

MALICIOUS

PDF

77.0 KB Created: 2021-07-16 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 516864e661f6a877ec0a309b52f95c4a SHA-1: 04f0daee30ba2ad34742e954c7d96b3c47b6187b SHA-256: c7a9f4ed32cb444a0e411b1360d5ef7756c71e87a2af3ddac9b0fa3ecd28387c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected 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 an attempt to redirect the user to potentially harmful content. The document's structure and metadata indicate it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/sq/ugae/~3/eaN1Eb74jJI/square?utm_term=you+are+impossible+meaning
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee1ddf588fb566951201f5/1626217951962/fabenozojuzazofibuduxufam.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0c60d9b6f23611951295a/1626392077164/how_to_make_a_big_modern_mansion_in_minecraft.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0ab705b7a40450a501393/1626385264214/nj_mvc_driving_test_questions_and_answers.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_off0000cc16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16792 bytes
font_01_sfnt_off0000e42d.bin
c15af80200c369dad518ed057bb41b9c2f721154232aea96955dd882fecd7ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10720 bytes
font_02_sfnt_off0000fc81.bin
06edd50daf058d8d45c15f22415033eecd60cb8703107a92e3613a63af024e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 16840 bytes

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