Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f27a474db1dc1fb…

MALICIOUS

PDF

75.6 KB Created: 2021-07-13 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ef58d4bcbc882e738509ea1df4913e8 SHA-1: 0bc3c2f64d0cc1bd4a99218f82ae8ab82c38086a SHA-256: 0f27a474db1dc1fb4744d5f8e97a0513941a5c8dac162637bb67ced838a8121e
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 PDF structure and metadata indicate it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/uzX87CUNjRg/square?utm_term=area+of+a+region+between+two+curves
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb0e228cbe050543713ce/1626124514637/mavixoratodatiwif.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c604fe2317389cedba93/1625867780457/environmental_impact_assessment_is_mandatory_under_which_act.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec950e243eac6055d04f94/1626117390164/pilokoreris.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecb0037f78e10bf03eaa26/1626124291769/electronics_for_dummies_all_in_one.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_off0000c569.bin
b4d8f93119366ce74481cd147f63f90616bdc1e5e36a383f11fa7b5aa572de64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16664 bytes
font_01_sfnt_off0000f116.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
font_02_sfnt_off0001092d.bin
415fdef782c69d1fd62396dfe6e4376a663218f1744e3429d73088bf3175c16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10840 bytes

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