Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4d6a5f1adcbb16…

MALICIOUS

PDF

68.0 KB Created: 2021-04-04 10:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f14a93f48160e878b135d788883f08d SHA-1: 2590c6e59afe869714173c9abe71b7dda0c06925 SHA-256: 5a4d6a5f1adcbb16b35fe6d320f937a1b6f89a037faaafd89c06b04c1fceab76
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is https://vilenefex.ru/strik. This suggests the document is designed to redirect users to potentially malicious or phishing websites, possibly disguised as search results or product pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=harga+jam+tangan+tissot+1853+prs+516
    • https://cdn.sqhk.co/sixitigoxeto/ijhchcg/photo_color_effects_free_online.pdf
    • https://cdn.sqhk.co/vizodejo/hi4jbY6/65136977545.pdf
    • https://cdn.sqhk.co/medukukekuke/gd9ZjS7/kazebofole.pdf
    • https://cdn.sqhk.co/nepajenine/pfjcjlc/ganiriputowe.pdf
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/5056294.pdf
    • https://cdn.sqhk.co/zirimikuj/jd5iaNp/ketidifudavumuv.pdf
    • https://cdn.sqhk.co/sugutomipu/mijhcrc/horse_kick_protester.pdf
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/8200636.pdf
    • https://cdn.sqhk.co/furafurume/F2jcwjj/incredible_journey_of_the_butterflies_worksheet_answers.pdf
    • https://cdn.sqhk.co/banibudofe/AHxNhiN/37803610072.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/balenometosilogokeku.pdf
    • https://cdn.sqhk.co/ramojezi/ajghjjj/simcity_buildit_layout_level_20.pdf
    • https://kupikonawu.weebly.com/uploads/1/3/4/8/134882044/8370756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://watusatuvor.myartsonline.com/alt_linear_functional_analysis.pdf
    • https://uploads.strikinglycdn.com/files/95ac86f1-c1fb-4d0e-970b-bbd03a4679f1/bexasikonefi.pdf
    • https://uploads.strikinglycdn.com/files/b27bb5fd-add3-4529-aac6-0edcd6bac11b/sun_joe_pressure_washer_comparison.pdf
    • http://dogurof.epizy.com/bowknot_platform_flat_sandals.pdf
    • http://mawidinivetobi.myartsonline.com/zolosedozule.pdf
    • https://uploads.strikinglycdn.com/files/38e61148-cb04-4c9b-b641-77b97194037e/gipudekuvibumejog.pdf
    • https://uploads.strikinglycdn.com/files/c8eca06c-5203-4654-8ef3-6a795ed61581/why_does_my_ps3_controller_keep_blinking.pdf
    • https://uploads.strikinglycdn.com/files/3e4cd5b9-504a-4922-8caa-7f7c38cf957f/what_does_the_couch_symbolize_in_the_metamorphosis.pdf
    • http://timofojitowamut.epizy.com/chestionare_auto_categoria_b_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdca.bin
1a83f8a590af6103b47c9812dded1108aa6d975fbec4ed0ce30e25f8d1f2e727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 5832 bytes
font_01_sfnt_off0000e196.bin
8669f28ad8ab50d64dfa0f80c65caf92d23bd65df7ce89c879962ebfb5e0c164		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 9656 bytes

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