Malicious PDF — malware analysis report

Static analysis result for SHA-256 634f029aa7494e19…

MALICIOUS

PDF

72.1 KB Created: 2021-07-16 03:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0b8a7458aafdc23aaad4c5c6358a9ec SHA-1: 3f415a586f268136a4be33a9f983db88983294eb SHA-256: 634f029aa7494e1904f82d0a06cbefeb052421aec3637fa4950b0c4c49093ee5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to malicious content. The PDF structure and embedded artifacts are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

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/WVKuihPcy9U/square?utm_term=210+cc+to+hp
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edfdd7017ec663b53fdc89/1626209751197/tonatukuresa.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e78e1bba333063f173aa63/1625787931697/question_tag_questions_with_answers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d4b300b83d0a108879f0/1625871540035/cars_with_manual_and_automatic.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_off0000b971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB971 16792 bytes
font_01_sfnt_off0000d183.bin
97c86ffcd102be23e55b7c76440046311922172db3377c6461b766ea7710b4f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 17392 bytes
font_02_sfnt_off0000fdc5.bin
42e7b5f1d84490341bee63f4747ed347b509d4f0384b708c5df56d88ceeda447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 9864 bytes

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