Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9723b63c83e583…

MALICIOUS

PDF

75.9 KB Created: 2021-07-17 19:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c982556bbfab30b0cd7e996d4160ecb9 SHA-1: 702865f7378fcbaf2a5128fb8bbb54b22430288c SHA-256: 4e9723b63c83e583f8e2f990d9c3c90728ab19790e1ef432c51ab9c79439a417
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, 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 itself is suspicious, with duplicate object bodies, and the wkhtmltopdf authoring application is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/eoPDrVzwpx0/square?utm_term=chinese+bow+staff
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e836385c1b846003427db6/1625830968294/74270257776.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f04e59caff6d31f7694a4f/1626361433984/xevufifaperaverevuwejalog.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7b668bb04542cee3a3cb/1626110822752/future_of_automation.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_off0000c9b4.bin
731d67601790bd3ea332d3d1b2598c8004ecb76a8ba9a41f45cf49a49d816b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 10424 bytes
font_01_sfnt_off0000e16a.bin
4f088baf256e3f883c8562f5b914b0b5314050658d0abca9ffcf9dd694322d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 16556 bytes
font_02_sfnt_off00010c19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 16792 bytes

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