Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a21cd620cfaba…

MALICIOUS

PDF

87.3 KB Created: 2021-07-16 11:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dd0bb98328b791e79bee05cc454c5d7 SHA-1: f759588f803187389918df4f032de477b9de7ca9 SHA-256: dd8a21cd620cfababda5e4f6b333543a739052cea14442dc5906c1117fe8415a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An external URI heuristic points to a suspicious URL, 'https://crysiq.ru/square?utm_term=truth+telling+to+terminally+ill+patients', which is likely the primary objective of this PDF. No scripts were extracted, but the PDF structure and the presence of a malicious URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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://crysiq.ru/square?utm_term=truth+telling+to+terminally+ill+patients
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee243c7dee9f188f76c144/1626219580365/32424365105.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f89819a9f87deb711fc7/1625880729125/what_is_a_participial.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7e26c268f363b0863668/1626111526795/16079769695.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e941f6cc7c08645927dbff/1625899510989/degree_completion_letter.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee2ba5e03b615e098d0522/1626221477355/pokojirotojejatadeb.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e86be442a7165951da429c/1625844708722/intermediate_2nd_year_zoology_textbook_free_download.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eca95f934d360eb28bfc8e/1626122591097/pdf_to_excel_converter_free_software_download.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_off0000f11e.bin
75094328fdf6960c2bfedd068593f86dd7f848f6e7bb9c1a0031c563bee64a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10876 bytes
font_01_sfnt_off00010a1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 16792 bytes
font_02_sfnt_off00012230.bin
27176cfd21d6a5f0eefd24b3d95e096e0c7aed77798bdf701b008eb690d6921e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 18040 bytes

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