Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd23f0ee0a8b05f6…

MALICIOUS

PDF

79.8 KB Created: 2021-07-14 04:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d75c33d1efa2c7181315addfebfa864 SHA-1: 9a08945fcdefee623c414df66ee00afdadad18a1 SHA-256: bd23f0ee0a8b05f67d97a59e5fa92b0a322ed68a90923d4234fa71aafac3e32e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs within the PDF. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution. The wkhtmltopdf authoring application is unusual for a typical user-generated PDF, further increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/~3/5JeRQhMeIYg/square?utm_term=thank+you+for+appreciating+me
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9097c8ce0e10532d1de45/1625885052816/puripitomutuki.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8328e64ce5371634c3f5/1626112808228/tatup.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edfdd0930ff80baa0f47d7/1626209744475/the_moonlight_drawn_by_clouds.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_off0000d462.bin
bdff6f9bd84ce717b0b3f290edd6c090853e8ee1b86316e691464e33e63cfd9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 17516 bytes
font_01_sfnt_off0001022c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
font_02_sfnt_off00011a43.bin
10908ca622b9e23cb720e73eac78c9fc2abf63b01813f95eddecc9e2dee5550b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 10980 bytes

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