Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de8c02dbeaa7f78…

MALICIOUS

PDF

80.3 KB Created: 2021-07-15 19:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0d39b1d2b8d3aec2b9cc5a8c145f965 SHA-1: 5423fc740a9db28355201e72104e6ffca7dd45de SHA-256: 5de8c02dbeaa7f788cd9c5e3489625282fb6a9c08fa6a6461ba437692ee29666
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. An external URI pointing to 'coretry.ru' was extracted, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links are consistent with common phishing techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/square?utm_term=clinical+manifestations+of+rickets
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee2db5b82b3047685f1ef3/1626222005751/menigotixirefepig.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e938882c5c2f6215c9cf92/1625897096699/explain_calvin_cycle_with_diagram.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f28719a9f87deb70d068/1625879175468/13182367719.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e91391e6a58043b6910732/1625887633954/the_ghostly_doctor_266.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8bbb43be7a25fda2bdc12/1625865140863/legewedufonizebetebize.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7ae5a51cb2a526cfa4559/1625796186859/81094907945.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edcf3b80caa629c1da81fb/1626197819673/munoravixevijiw.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8bdebeebddd6e48ecc0d6/1625865707530/passive_voice_for_kids.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f6e0e6bd1231e6062d26/1625880288822/47020283879.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f02ac2161c0660543a213e/1626352322892/63568466193.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e967182dabf27235566399/1625909016816/lipifilututowape.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_off0000db8e.bin
2458dfd626f04de4d936442fac05cc9ad9f05e07dd0c483e131dfe8604396002
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 10620 bytes
font_01_sfnt_off0000f3de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 16792 bytes
font_02_sfnt_off00010bf0.bin
a13f8815d8f2cefd25ff6d060ae7ef32af05419b863ca90a21e1f537f6ca223d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 15956 bytes