Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad82284d5543061…

MALICIOUS

PDF

78.3 KB Created: 2021-04-15 00:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2a06af4217759057ec959356dd5adf28 SHA-1: 30a0b5235584c718c18b5a857c41d2635ac942e4 SHA-256: cad82284d5543061193d7f042f64543ded9b6f98cbc88b1788049337dfb32935
186 Risk Score

Malware Insights

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

The PDF file, disguised as educational content, contains a significant number of external links, many of which point to disposable hosting or unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is vilenefex.ru, which is likely part of a link farm designed to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=tablas+de+multiplicar+salteadas+para+imprimir+sin+resultados PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_6049599c423bc.pdfIn PDF document text
    • http://zespodsvetkoy.site/33580771733ged0b.pdfIn PDF document text
    • http://pixxel.life/65056657521v62bt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_6006af2ba9a21.pdfIn PDF document text
    • http://sberbank.link/69712055767w7zoa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464862/normal_601ebd226ee0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_604ac943bac5c.pdfIn PDF document text
    • http://missunik.space/sogavizonaxoseca6rb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_603160709967d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e1a3fa-1f17-4b22-a2ec-2275cc96640f/vesutenol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4045409c-8db0-4ba3-b9a3-52b2ee221882/engineering_systems_engineer_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b664cd8f-cce9-4436-8a89-54995e47ec12/tefolizujaremud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a472c8f-ff75-4914-889e-a0c0c8c51ae3/30924322839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f0e4f7-1c26-4665-b2d2-f499a7fed0bd/asp.net_core_mvc_route_config.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09be7588-38c7-4a61-afdd-f5d41782968c/philips_lifeline_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0d52ea-7d57-4b34-a142-0a7dc4a00c40/sepir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906cab96-fe89-4fd1-9668-893782605207/18133148587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72570c17-d138-48b7-8a56-c3544e1c271e/how_do_i_fix_error_code_e01_on_a_lazy_spa.pdfIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_9548ca2c343f4e54a09c9fa46c8672a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e27e85a-0037-4637-a3b8-16ef33180ca3/ditanipitap.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_3d835b658b814a94bac1b91ebaa3b99f.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_0f692b3e993e4a5dad03841be21e72da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01520f5-0bb8-4ec3-9a68-2b470c8fa521/daberasafalijeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036457ee-6b9f-4aec-8bf7-f621c3f3c92f/69575633340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde31b26-640b-40d0-83a0-e94830dcd4fb/29530449059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9d75e2-1395-4f47-ba44-8c3c9d9518ee/7297401262.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_e7239b33a97642d2a239b63c068b2c9f.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_9859a9e76a974e059f9f3529a9166dc3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5308 bytes
SHA-256: a5a798aa5cf5a6ed970bbc0f17897886e1e34599a3ad94d07d178f0d1b14b8a3
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 11036 bytes
SHA-256: 85aca119cef923c4e1ef4699c49118775f3c884e91361bde6e8435808f45f501

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