Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaff4b042e5dfda…

MALICIOUS

PDF

99.0 KB Created: 2021-07-17 21:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d4e3b3080f102859a89732bbc46110e SHA-1: bd33b3027161234e26de73eb20153c0fca462aeb SHA-256: aaaff4b042e5dfda8980a6f36f969589a5855b8a2147eeeb2f0cb71c4a4811b8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as 'Pdf.Phishing.Trojan'. It contains multiple embedded URLs, one of which is flagged as a potential phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, aligning with phishing or malware delivery tactics. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier clean score 0.1321

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/iCUEKX862tE/square?utm_term=cri+du+chat+syndrome+chromosome+abnormality
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f02e02d052060b21f92f7e/1626353154844/negligence_leading_to_death.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec76e0a3e9df788e6c13c5/1626109664681/toditilo.pdf
    • https://medlineplus.gov/genetics/condition/cri-du-chat-syndrome/
    • 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_off000120d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 16792 bytes
font_01_sfnt_off000138e7.bin
e8cc6482ffb63a9a5aa9a4e3498fd4d095cf3b1fdde069682d48e69a7d4198b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 17892 bytes
font_02_sfnt_off0001667f.bin
277524c7605a41cddb900f3915d0268bd972e0b74f837074dfd6de806c085a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1667F 11020 bytes

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