Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9dcec30054ce93…

MALICIOUS

PDF

92.3 KB Created: 2021-07-13 23:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eee1bffe07fd13f19952a65d9ed0678 SHA-1: a28cf84e9c6f90d84f16f176329f3fb125640b74 SHA-256: 6b9dcec30054ce932459df154ae3ecbe20044d13cbea69440c36faa1da60457f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'chcial.ru' was extracted, suggesting a phishing or redirection attempt. While no scripts were directly extracted, the PDF structure and embedded URI are indicative of a spearphishing attachment designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8712

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://chcial.ru/square?utm_term=what+are+the+energy+transfers+in+a+battery+torch
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e926e35fa2eb14b90bf229/1625892579141/storm_is_over_by_r_kelly_audio_download.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec9240cd1a1204f6c95331/1626116672260/endnote_office_365.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7c705f604029b990c44d/1626111088808/87272467751.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd1c52e8a4a2aca788a9b/1626198470041/77955439730.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e86ae0f244fe4368171dd5/1625844448212/uses_of_test_tube_rack_in_laboratory_apparatus.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec84af2de985067773a1ac/1626113199944/why_do_you_want_to_work_for_our_company_answers.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e810e948fdc25940430acd/1625821417242/67165066882.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_off00010728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 16792 bytes
font_01_sfnt_off00011f3a.bin
4f18474804d5aab727b5b8db9de913b5044866f0021426e38b49a3755d77fd8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 17076 bytes
font_02_sfnt_off00014bca.bin
7ac66c6fe992a6a5d73c5c9bbc2d6f3af468c5fd902f3b319dd607cacb36c94f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCA 10816 bytes

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