Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05eeb6184f9f586…

MALICIOUS

PDF

85.1 KB Created: 2021-07-12 21:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba033f3c22944d4e841eb192d643b769 SHA-1: edb993fdcc20af3bd6a702fe24d7de66d27460c4 SHA-256: c05eeb6184f9f586f1643529d75623e4b37cbf1ee8efea5981df5f76b4d3dae2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://chcial.ru/square?utm_term=silicon+is+made+of', which is likely a phishing lure. The PDF structure itself does not contain executable scripts, but the presence of the malicious URI and the detection verdicts strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/square?utm_term=silicon+is+made+of
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9540b0cbdad4d35075a2f/1625904139904/reading_and_comprehension_worksheets_for_grade_3.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec83864c0b954f9ea41a63/1626112902650/convert_png_file_to_free_online.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec85f5c3fb560d26f31d3a/1626113525400/5583862704.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7e3e12c1416d2f1a3f24/1626111550575/98457622778.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_off0000eb52.bin
844b3accbc317570bb73d46a2b91a91a1b57d9c7254a94c1a8316e2b7a0fc55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 17616 bytes
font_01_sfnt_off0001193d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 16792 bytes
font_02_sfnt_off00013154.bin
03186c1eef876e936d27da27316f5f180435ef314dba45037dae6642dd127537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 10516 bytes

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