Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde1bb91a35c293c…

MALICIOUS

PDF

76.2 KB Created: 2021-07-13 16:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21aaed8ec480dbf5dd4f3b828a08e2c4 SHA-1: e035300b7335916d7faa80311dd9f3a9ffd5af84 SHA-256: dde1bb91a35c293caab6fc29141cf7080d42b6a697e87b2d98585546d06a0271
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. An embedded URL points to a suspicious domain, likely used for phishing or to host further malicious content. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user.

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://wastran.ru/square?utm_term=biodiversity+is+threatened+by
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e932d558c6623f0382dd64/1625895637902/renide.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91afc3ba7d954d545f9e5/1625889532665/3447421009.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec90255f8bf969071ed563/1626116133896/overweight_min_pin.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_off0000c742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 16792 bytes
font_01_sfnt_off0000df54.bin
3855e605e05a52757de8b31f265d076f85a78eed20ff56ad9b28ba5a067b249b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 17568 bytes
font_02_sfnt_off00010cd2.bin
3f42e53c652bc4637b1d4aea7475b3da482926e2cfba2329b188e6d5d4a74e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10672 bytes

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