Malicious PDF — malware analysis report

Static analysis result for SHA-256 618ad94918b1dd3a…

MALICIOUS

PDF

105.9 KB Created: 2021-07-13 21:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6d873e8642d1bd1b38a3ecea5d4274f SHA-1: 8aedbfe4dffb47aabc7e089772c7db6b24ecef80 SHA-256: 618ad94918b1dd3a062d7e61e4a722926e611ab73f322babff11306fbe787f25
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, a common technique for delivering malicious payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While the document body is unreadable, the embedded JavaScript likely attempts to download and execute a second-stage payload from a remote source, aligning with typical phishing or trojan delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5412

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/cEZ-xJcQpFE/square?utm_term=optical+illusions+with+answers
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecb7c42c7c415af4604e9c/1626126276693/47557514722.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8fe9f309bd63f3d849c4e/1625882271859/sociometry_in_research.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc3db4485e42169fef55b/1626194907141/lizulal.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd882a0f2ca3483d15aff/1626200194706/94405336492.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_off00013cbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 16792 bytes
font_01_sfnt_off000154ce.bin
5dab9e5b7bc4badbdf5a2a8331e892814ec785a28a605406364cf98635e92f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154CE 18180 bytes
font_02_sfnt_off00018339.bin
4d64dfadf2c149ca3d764bdc06047328e778a050457637a9bbd42578d93ff7c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18339 10680 bytes

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