Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8e0c416b29d0ed…

MALICIOUS

PDF

76.0 KB Created: 2021-07-15 10:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e7e3ad783c3c0ac2c15a9ea9ce30507 SHA-1: 9f08620cdf13e2967d0d17bb0d45002dfc1a74c9 SHA-256: da8e0c416b29d0edbd5cbd6ca2ddd1543768e452b16c070b419492f082ea7d74
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 and the PDF structure suggest it is likely used as a lure, potentially for phishing or to download a secondary payload. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/razvivatel/yapz/~3/gPkW7oTCsL0/square?utm_term=traction+pdf+download
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9494c8312e4ee1dd9ad7/1626182805024/definition_of_calligraphist.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8b01a3e9df788e6e181f/1626114817539/5169041079.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee0b481cf0e6777f2a9439/1626213192790/the_meaning_of_reproduction.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efdaf198ba4d7461160830/1626331890058/quotes_about_foolish_man.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec90c344349d7bb06d6108/1626116291487/security_guard_resignation_letter_format.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_off0000ca8a.bin
9affb704b423564abe9e2e47222949ba7a88b2051ee03056923c3ff01c084d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 10360 bytes
font_01_sfnt_off0000e21a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
font_02_sfnt_off0000fa2c.bin
de67810c84d06c6823e7c621bb660029e39e7365b3b4717ca12da1832832a29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 16336 bytes

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