Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb66d3725ce40a95…

MALICIOUS

PDF

87.8 KB Created: 2021-04-05 00:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c8f84f314249c414c43edfe2c4ead32 SHA-1: df02f3eabe9aa819fe27c79b5714b90c368d8756 SHA-256: eb66d3725ce40a95bd58acd4db386fcb54e1a8f81b4c0eec4a112f4680894ed4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'The star cycle student worksheet part 1 answers'. No scripts were extracted, but the presence of an external URI and the nature of the detection suggest an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=the+star+cycle+student+worksheet+part+1+answers
    • http://fakts.design/dodokozulazulopezar6od0.pdf
    • https://cdn.sqhk.co/ruvonusebex/jMgd0jc/degopenotajeve.pdf
    • http://idealica-it.website/ritugaxepogeziliwusoniky625a.pdf
    • http://hotloveme.online/182850440129eg5g.pdf
    • https://cdn.sqhk.co/zivudasexoni/S9ghOz1/perfect_pe_cutting_board.pdf
    • https://cdn.sqhk.co/naliwanik/jjGhdie/brothers_in_arms_3_descargar_gratis_para_pc.pdf
    • https://cdn.sqhk.co/ribobujir/fV1jjif/chinko_ekun_bless_me_instrumental.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lixisariwulo/zorejojeboxunab.pdf
    • http://rixuzomobe.epizy.com/59293291536.pdf
    • https://s3.amazonaws.com/mogedozara/pedanerekunidepake.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_8e0a47c175c7491ca22d0d67ae250b3f.pdf?index=true
    • https://s3.amazonaws.com/temujonuwu/94443678182.pdf
    • http://wuzugimekiwetad.epizy.com/boseroxo.pdf
    • http://najaxobefirag.epizy.com/xubijegu.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/63824625422.pdf
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_75b72e1f1d6b48b3a38f58bf56c945a4.pdf?index=true
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_541dc637cd2743a9b8e044904e4eec7a.pdf?index=true
    • http://lobunuwofapow.rf.gd/area_problem_solving_worksheets.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e0.bin
4d9c4e185c319fd2c527da4556c2e018122c6a633d363ae5df1ef222b9cf8dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 5256 bytes
font_01_sfnt_off000107d0.bin
3435bf2d2a62b20157461a41a27bdcb34b60e5c8df74f3b10f2a265bd651c306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 11072 bytes
font_02_sfnt_off00012df5.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF5 16092 bytes
font_03_sfnt_off000142bb.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142BB 4324 bytes

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