Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc5d8d3340c976f…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 22:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a8e73972c0b8e60470e4f963a540011 SHA-1: 70025b07db8625da8d4adf75ac45c4dd6ae404a3 SHA-256: cbc5d8d3340c976f5815632ac5629ccce3aa5609f1fc0a761b115c639d841baa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to potentially malicious sites. The primary malicious URL identified is jumiwimov.ru, which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to redirect users for malicious purposes, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jumiwimov.ru/strik?utm_term=google+android+developer+documentation+pdf
    • http://rasudilikid.mywebcommunity.org/how_to_use_cuisinart_13_cup_food_processor.pdf
    • https://cdn-cms.f-static.net/uploads/4388420/normal_6041446d51485.pdf
    • http://duvejajenivogik.getenjoyment.net/maytag_maxima_x_washer_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6001d70ae4c8a.pdf
    • https://cdn-cms.f-static.net/uploads/4379742/normal_6025c1dbb46fb.pdf
    • http://vevufilusik.scienceontheweb.net/powolepuwunu.pdf
    • https://cdn-cms.f-static.net/uploads/4408987/normal_602646079b6fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_618217d7117946c8baaa3c650de4c5d6.pdf?index=true
    • https://s3.amazonaws.com/pizivurapab/a1c_to_blood_glucose_conversion_chart.pdf
    • http://zasuwunal.myartsonline.com/87599938668.pdf
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_dc729c4733ee40c0a333fd9a86fbdcd5.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_a2b55f113cfc40038355ef4f2b2e004a.pdf?index=true
    • https://s3.amazonaws.com/rujimidujek/vidmate_music_er_for_iphone.pdf
    • https://s3.amazonaws.com/tosego/humanism_renaissance_worksheet.pdf
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_eefefdcdd0044ba38b8f206d4e2b5a2b.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/apc_smart_ups_5000_xl_manual.pdf
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_40173041ba9a4d009ea11cb7df2763ff.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_828caa2888584a10b152b402cfd82410.pdf?index=true
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_26b41d87f3364ba3924defdab8ac46f4.pdf?index=true
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_36aedac400764648a1f730da76c6a2bf.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_5ceeb379053145d49a87b3bbd4faf5f2.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_6a3d0bf033c04e46b1996828389003e0.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_f9eb7a5f42f140e58bffe6165b85c0e7.pdf?index=true
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_9b0ad632a35741ceaa8053566dc568e4.pdf?index=true
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_43c5c42045c24e01bc7111ffbdf48622.pdf?index=true
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_099c384eee294f3cb9671514cc044f87.pdf?index=true
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_da417758a92d4746bcefcad141699822.pdf?index=true
    • https://s3.amazonaws.com/dixaleko/release_notes_template_for_software_project.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_off0000f980.bin
3af3ec2b85dc834b789f8d3b0d76049f98f5cd2230a3ab64f6b4385e38c68b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 5388 bytes
font_01_sfnt_off00010bd0.bin
994db47d0953d8da22b945acf4525e3320edb6329fd249aadda36b2ba32b248c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 11208 bytes

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