Malicious PDF — malware analysis report

Static analysis result for SHA-256 746eb1809181f820…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 15:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dba4ee2be426ac9d8775d7d7341f957f SHA-1: bb663229693ecb7611f597191d679cce464c188b SHA-256: 746eb1809181f8203e91111da89b4e95974f3a33eca8e170b82f04776e429d6a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded external URI pointing to 'https://chcial.ru/square?utm_term=what+does+humility+mean', which is flagged as unknown reputation. The PDF structure also shows duplicate object bodies, a common obfuscation technique. While no scripts were explicitly extracted, the presence of a phishing-related signature and a suspicious URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1792

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=what+does+humility+mean
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecc67f752fe37f0c0b351a/1626130047735/99936238871.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed15976ebf0d48ea8b9d26/1626150295259/noxubilil.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed3f9064a4563c8f7b83ae/1626161040788/good_morning_text_to_make_him_want_you.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c499.bin
29be2a3acec01076aea0e7ee72d9cd5d317a4374c5cb1e200d2ba5aa7e3d429b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 10620 bytes
font_01_sfnt_off0000dcb1.bin
3a34d1f1b737fe7db4e4cb210b5177958592e595b6e66830f263912685a1c87d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 2812 bytes
font_02_sfnt_off0000e7db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
font_03_sfnt_off0000ffec.bin
5a230f5e5632118a97fff69abb74d0a9b2afd592a3a55702065777805cdf8a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16692 bytes
font_04_sfnt_off000117ac.bin
d179f350b691b91279e7a8c23d1dd1c15aa7d88000fbe7cbcd9666c7b1650d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 18748 bytes

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