Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64100778b3c9b55…

MALICIOUS

PDF

73.4 KB Created: 2021-07-13 17:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d3fdbf7e3dadf1d44756ef5706622a8 SHA-1: e0a86f3ad3a0d7b59bba64463015a85e16d3db5b SHA-256: c64100778b3c9b55fa2756c1bd2961e980a3457e886394e811bcdfb3a7340429
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. It contains an embedded URI pointing to 'laborke.ru', a domain associated with malicious activity. The PDF structure and embedded content suggest it's intended to redirect users to this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7000

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://laborke.ru/square?utm_term=absent+minded+synonym
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e79b1385664d35b0e3c1a8/1625791252079/to_go_back_on_your_word.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec90eb3080d76c7a51c10b/1626116331244/rebijumetubivos.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed7349c2ef2d11c8d68e94/1626174281979/convert_to_office_free_download.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8f878dc37083541b6f5ed/1625880696651/1_watt_hour_is_equal_to.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_off0000bfb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 16792 bytes
font_01_sfnt_off0000d7c6.bin
2bde6de814a8570fd9037d0e787aed8e6289e468ce2907e149a918bf0890d358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16600 bytes
font_02_sfnt_off000102bd.bin
e38ecf2744c28cc71436784b4e4602e4724c5ea67fb56e4ce113ef6cca69d569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 10336 bytes

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