Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f09f3faa6ee876d…

MALICIOUS

PDF

80.8 KB Created: 2021-07-16 01:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 159d0c091c80ddd289e36c9b7e249e11 SHA-1: c1778580b4e57dd3ad704d77ce5888e47fc528bd SHA-256: 8f09f3faa6ee876d605a1d15cd6d666472b362ce7f093d9a3504454085d272e9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also indicated a high probability of maliciousness. While no scripts were extracted, the PDF contains an embedded URI that points to a URL, suggesting a phishing or credential harvesting attempt. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

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/~3/7R6buoffwiA/square?utm_term=business+administration+objective+for+resume
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94f1de6a58043b69304d3/1625902878106/92210904937.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee272086aa876280baec3a/1626220321198/definition_of_function_overloading_in_c.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee4a540b33b63bb8c6e0ea/1626229332722/sorijino.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8b334076e3e03a9e72125/1625862964198/91565235781.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_off0000da24.bin
042942f65fad2aea972fd1af0bf80c9c76558aea1f49d8f9e4831202f8d1ba4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 16096 bytes
font_01_sfnt_off0001038b.bin
8c080b395473460c9a5063177f217a00482f95f2becb10ba66f56dd5fd7f3338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 11080 bytes
font_02_sfnt_off00011d6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes

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