Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a028fa5b647616…

MALICIOUS

PDF

76.2 KB Created: 2021-07-14 00:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bccef1163968d457b69bd4d74be3fb6 SHA-1: 19ca08ebeb3149b8e47e26201d7cdf19a7548008 SHA-256: a7a028fa5b647616c8b1310ad327bf2cae6c7d82d2f790170188af86e2fa37c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. The presence of embedded URLs, though currently classified as benign, suggests an attempt to redirect the user to malicious content. The file's structure and metadata indicate it was generated by wkhtmltopdf, a tool often abused for creating malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/~3/4aHNpQc2m6I/square?utm_term=forensic+analytical+techniques+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d1a75ef51a130ea0a9eb/1625870759349/10_day_luteal_phase.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95b7b085b1c120f99f8d8/1625906043539/parabogozi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f1a6c0906550d9090af3/1625878950766/11731685407.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91555b630645a0ef6f8d7/1625888085642/48790670774.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0356bf52576c624b069b/1626211158235/watowole.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_off0000c76e.bin
e4d9f999c6b46492c12fd9a30e6c0554834e6784a1e1be9f10dabd3f0b24dbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 16248 bytes
font_01_sfnt_off0000f1b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 16792 bytes
font_02_sfnt_off000109cb.bin
5d2f958324ce19fcedd58de036aad0a3f2968fe220accc53afdef2f7644e07ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 11056 bytes

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