Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbe22c66a5853b7…

MALICIOUS

PDF

77.3 KB Created: 2021-07-14 06:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6089620f9d4d9bae5942af363567cad8 SHA-1: ada712ed5f883213c368be3988f4fa0ac0e9eae4 SHA-256: 5cbe22c66a5853b7797617526decfc58b4f008f19324d1052eeab6298128e8f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to PDF conversion tools, suggesting a lure to trick users into clicking embedded links. While no scripts were directly extracted, the presence of embedded URLs and the nature of the detection indicate a phishing attempt designed to lead to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/NsX9ihectO0/square?utm_term=pdf+to+any+converter
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e923aa83ae0c4902392c5a/1625891754332/expired_drivers_license.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edfdeea50f6e33a327cae7/1626209774243/geometric_distribution_problems_and_solutions.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9e5ee0ada229be5955bb/1626119774221/fourier_transform_pairs.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edf601e635d71664642600/1626207745902/83202455676.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e776e5639fd3490b8f05f3/1625781989781/how_to_hold_a_bass_trombone.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9b31c48108232e44b53f/1626184497327/taxpayer_certainty_and_disaster_relief_act.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9a259cb57f380a79a3c5/1626118693483/bowilo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8df8c81c37306b2f6438/1626115576726/zejejukumegonege.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92e72b630645a0ef7d821/1625894514327/introduction_to_macroeconomics_class_12_notes.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e904bcb68d8f0f4bf6fa47/1625883836783/order_by_sql_alphabetical.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9558158c6623f0383f79b/1625904513943/how_old_is_danielle_cohn_age.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7bce25c1b8460033d5c29/1625799906827/46228711002.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8f5ac81c37306b2f8c2b/1626115930945/marketing_proposal_email_sample.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e960591448b061984a4446/1625907289885/menopause_and_fatigue.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_off0000cf85.bin
7a5c091dd46671b77a55e27f6d00b8bdaf5a42852cf693d566e385279d1f738e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 10344 bytes
font_01_sfnt_off0000e712.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 16792 bytes
font_02_sfnt_off0000ff24.bin
65fd22a67229652813b9e069f8c58c48c4b6ea9357effd1a994ce53b9b4911a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16100 bytes

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