Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cdfd42696aff6f…

MALICIOUS

PDF

80.8 KB Created: 2021-03-09 09:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68e8590d6e15b133bb57401e5bee14e8 SHA-1: 486f483bc6ccba5964ddd29036c8ab6795b1e444 SHA-256: 26cdfd42696aff6fc63579eea5c070a1318664f3d8c39d94660ea96a564009e9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results or document downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous URLs points to a redirection scheme.

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-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://botokaw.ru/award?keyword=html+codes+for+websites+design+free+download+pdf
    • https://static.s123-cdn-static.com/uploads/4389805/normal_5ff1598b20e31.pdf
    • http://jivavesomuviz.getenjoyment.net/35197266950.pdf
    • http://leree6.club/how_to_describe_draco_malfoyabtzd.pdf
    • https://static.s123-cdn-static.com/uploads/4410956/normal_5ffdba8252032.pdf
    • http://cardio-natural.info/algebra_solving_equations_edexcel_gcse_answersduijj.pdf
    • https://cdn.sqhk.co/rogevuzazi/jfoigbF/rank_one_parent_login.pdf
    • https://cdn.sqhk.co/gisatajofo/HDjhSwl/play_with_friend_online_ludo_game_for_pc.pdf
    • http://suzofovolavuk.scienceontheweb.net/environmental_impact_assessment_of_road_construction_project_india.pdf
    • https://cdn.sqhk.co/riketumes/oIieF2B/6449147077.pdf
    • http://dakajak.medianewsonline.com/tidamilekolixudegibixex.pdf
    • https://cdn.sqhk.co/doporaba/Fjje6bV/90535440109.pdf
    • http://lotsmen.com/list_of_social_issuesa1ngi.pdf
    • https://cdn-cms.f-static.net/uploads/4420747/normal_603a605f79862.pdf
    • https://cdn.sqhk.co/jisaside/jicgf4T/7882859728.pdf
    • https://cdn.sqhk.co/fovomesit/w3gdgjs/ufc_schedule_wiki.pdf
    • https://cdn.sqhk.co/posukomokufi/cvjedgi/73782976938.pdf
    • http://kedepoba.sportsontheweb.net/descartes_meditations_summary_2.pdf
    • http://bumasujofoj.getenjoyment.net/memarerunotisuxuzatabat.pdf
    • http://hookup757.fun/xulimenuvepaak48a.pdf
    • https://cdn-cms.f-static.net/uploads/4490961/normal_600b1dc68b56d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_e83a2bdea3224da5ad527b94b65e0c05.pdf?index=true
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_d0d279aeb325438eb0b1b3f6b6630602.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_off0000ff78.bin
5ad0345ab9ab4635e3dae09ea7f0e31a5f434bde1fd31c7922bb5270ce4d6277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 5668 bytes
font_01_sfnt_off000112b7.bin
56be4929e58c605bd6b7db58099349b23675d62c8b9164fb29b945e46abcb4f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 10104 bytes

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