Malicious PDF — malware analysis report

Static analysis result for SHA-256 488b6df3440e68ef…

MALICIOUS

PDF

74.8 KB Created: 2021-07-14 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 061e09aafe498ac46bc86818a6767e9b SHA-1: 98bb731e164a5e2010c6da1cf46fdcab2b17110f SHA-256: 488b6df3440e68efe9cd5e1d161d17a9c828cdb52055a7a2716eed122d06c1fe
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The presence of embedded URLs suggests the PDF is intended to redirect the user to a malicious site. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/um1bUVUAM38/square?utm_term=how+to+add+audio+in+screen+recording
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e93267085b1c120f98a1a4/1625895527231/school_management_system_project_in_java.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e95c59787dde1a90afe3d8/1625906265121/66558827662.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed8b35fc46f1629a06c4e4/1626180405674/97418734580.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e82a4246a8e17713e7e40d/1625827906508/tailor_and_dry_cleaning.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_off0000c4d0.bin
286e54801840c057f466af80ba682707b3a933e6a9fff305dc88ee1421879717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 10676 bytes
font_01_sfnt_off0000dd3d.bin
234ac4b74786f31f0b81d8070f43e01f43d29f114230fb08e1961f62846f44ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 16300 bytes
font_02_sfnt_off00010774.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes

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