Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d18df5d7e3c1660…

MALICIOUS

PDF

88.0 KB Created: 2021-04-07 19:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76cab9210c2940642a99b81f692509dd SHA-1: 60e2db3983bceb97de2458b18015c862d7c69ae5 SHA-256: 2d18df5d7e3c1660f3a9fab25a6e2eb1d65da81b4d62293ed6e0dff85da684fd
126 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, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no specific script execution was detected.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/wix?keyword=armasight+spark+core+ebay
    • https://cdn-cms.f-static.net/uploads/4465393/normal_601f04be2fc4d.pdf
    • https://cdn.sqhk.co/lokiwejawe/WM5idgd/53399596569.pdf
    • https://cdn.sqhk.co/wesaduleb/jchbThe/xotorifojatutawokitife.pdf
    • http://1freedom.space/displacement_velocity_and_acceleration_worksheet_keyg1l69.pdf
    • https://static.s123-cdn-static.com/uploads/4387428/normal_5ffad558bd167.pdf
    • https://cdn.sqhk.co/dirotiweze/zBibieh/69006033722.pdf
    • http://suvonenexazu.mywebcommunity.org/zefazejebepidadav.pdf
    • http://scotiaenlineape-personas.com/71216375640w9322.pdf
    • https://cdn-cms.f-static.net/uploads/4485813/normal_605000afcea50.pdf
    • http://kovafuwir.getenjoyment.net/54207101599.pdf
    • http://frontend-developer-azaynullin.site/whirlpool_washing_machine_technician_numberahfcj.pdf
    • http://x-bionic.shop/wujenefokqgb3c.pdf
    • http://cmbmarketing.agency/the_master_key_system_quotesffdu5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_d3e8485a75ca4fd69a0aa30f556139b4.pdf?index=true
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_7ae5403f27c145dc876c4bbd2651665d.pdf?index=true
    • http://daximogosamov.myartsonline.com/lafosakog.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_30f200603bd64450a62124245c4ba993.pdf?index=true
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_77407ae16cae4aac88c32d2caab9e1a6.pdf?index=true
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_0861d7779c5f465a89a535332ee01d20.pdf?index=true
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_f9e061698a2749d8bd4433915639cd72.pdf?index=true
    • http://wufagezigedo.onlinewebshop.net/elementos_radiactivos_de_la_tabla_periodica_y_sus_aplicaciones.pdf
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_c4e7135bb6d44221a8ebc1b21ec5aaca.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f8.bin
a7d44a832c734857ceb5356e4715a30a5fccddcdd6da1d56536fe6322feb6703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 5608 bytes
font_01_sfnt_off00012ae2.bin
75a3e066d853ac6c459f478a88f4c4e39b0c0651bfcb8be7e93232c05c26e778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 11708 bytes

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