Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b55d356bea71fe…

MALICIOUS

PDF

77.4 KB Created: 2021-07-17 17:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93ec19672090a1d79f6ebb469b75f345 SHA-1: 535f4d27a31d6ab42b12bb2e115d57db80593b26 SHA-256: e3b55d356bea71fe7a9c6572fe91cae38f616bfd9acf2679d2d110319b599e07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure and the nature of the heuristics point towards a phishing or credential harvesting attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/gPkW7oTCsL0/square?utm_term=how+to+take+picture+of+computer+screen
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1a74db7d11544a132beb4/1626449741477/lowazosatanigevawusemafep.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c6e3dd5c0c1026eee613/1625868003887/8383162425.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7820ea77fe36cfdb94e7c/1625784846353/evicted_chapter_2_summary.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edb5434325c5343bbc2929/1626191171184/staying_in_a_relationship.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f186a1f9088a713e6e1173/1626441377627/23999870349.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda5a0151a035e9e7c8e74/1626187168621/tricky_maths_questions_and_answers_in_english.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee6a1f2af4c01978ff8dd0/1626237471720/miseto.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f29d16a8f65e35b6d1df9a/1626512663110/nazivajisi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a6c725441e1b37831335/1625794247666/the_millionaire_real_estate_agent_gary_keller_free.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_off0000cd21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 16792 bytes
font_01_sfnt_off0000e533.bin
4ae7f980401cac39c943a39f4f27b3bc78e1e00bbc9994ca0807d2e12ddc082a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 16544 bytes
font_02_sfnt_off00011026.bin
ae519de5696ae7b579cdb4ca51b1c1bd3576b52361b544ba5568f2ef6470b34a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 10864 bytes

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