Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5a18fdea8f7cf7…

MALICIOUS

PDF

80.3 KB Created: 2021-03-16 18:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d39a91a88e90d471e28a91ec6c234db1 SHA-1: 01d135a11efc4976cd95d5dd4c9b13f1f9851734 SHA-256: cb5a18fdea8f7cf7c6f1727ea7b1ae811ba15cea42407b1e283538cd4d020f6a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, which is also listed as an IOC. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to 'unblocked call of duty zombie games', suggesting a lure for users interested in gaming content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=unblocked+call+of+duty+zombie+games
    • https://cdn-cms.f-static.net/uploads/4417024/normal_6029034decf27.pdf
    • https://cdn.sqhk.co/terodekijur/cFhZ3ij/mercury_racing_outboard_motors_for_sale.pdf
    • https://cdn.sqhk.co/mivuxakadu/Ljj8Gih/podaxumeranogulilozulira.pdf
    • https://cdn.sqhk.co/jarixizotib/dPm08co/vobikiwujali.pdf
    • https://cdn.sqhk.co/jorafulati/2ghahgj/compare_numbers_worksheet_grade_6.pdf
    • http://menformula.xyz/100229490569abkn.pdf
    • http://salonlabs.xyz/samiruwizue31j7.pdf
    • http://pagebake.com/daraterubemak3c.pdf
    • https://cdn-cms.f-static.net/uploads/4454048/normal_602db367e07b3.pdf
    • https://cdn-cms.f-static.net/uploads/4372719/normal_603f06e911f7c.pdf
    • http://haustova.com/74984755166yj4xf.pdf
    • http://123dutch.com/jubonubifao66sb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6f028988-8a10-4630-b425-61d71ab057d5/asus_rt-n53_firmware_restoration_utility.pdf
    • https://uploads.strikinglycdn.com/files/f7265337-6a11-4349-b61e-c93955d868cc/82273182782.pdf
    • https://uploads.strikinglycdn.com/files/6998ac3e-3a5b-4c86-94d6-94c7a224cf36/wuzokap.pdf
    • https://uploads.strikinglycdn.com/files/20cd6660-f8a2-490d-80d2-a6702038e4d1/22902876034.pdf
    • https://s3.amazonaws.com/jefobexapulow/nilosevuwomurikasakiv.pdf
    • https://uploads.strikinglycdn.com/files/df4af1e9-4838-4821-8918-0126309547e6/mevisosefowawosomit.pdf
    • https://s3.amazonaws.com/tuxenipup/lover_unbound_synopsis.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4e.bin
ddd0dd9d9e6e8dde6f939670e38cf9733ee5fc49a87af44b28070f74022e5a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 5472 bytes
font_01_sfnt_off0000feea.bin
a3ef1d6cd6e2a5e2bad4aeca74010e7e97548a63c3128acb20304d5b0794ee45
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 11904 bytes
font_02_sfnt_off000125f6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 4324 bytes