Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e4a508871a7f59…

MALICIOUS

PDF

76.5 KB Created: 2021-05-28 09:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9dc69f4ecef22d16e642b4ad489b9f5 SHA-1: 9fc02d6a977b832256c0568dc69ca71156bc9083 SHA-256: c4e4a508871a7f597771c5ca1c92f141b89e351352a12af05cf6db316eecb57e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/strik?utm_term=if+i+ran+the+zoo+banned+book PDF link annotation
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/guxotipejuzufilutar.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/7f39d537632e4b.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/a0172338-1ecc-4a7b-b21c-eda63ddaa198/62371315192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b174bdfb-1b23-4398-a0d7-44718d6c6f5d/37306279659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f888d7-6e96-4913-90f3-e4933e3d8fd7/67346398521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea75591-896a-43e8-9c6d-bf5b1433a4ea/micro_mini_dachshund_puppies_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0db35fa-7f94-4a27-bf3c-0cf54b61be47/telogubexixakepuxusoniwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826295fb-bfd2-4ed7-b628-d337eafea748/rukunetorejivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6891c610-9c00-4f6b-9690-7d8c7cf47877/62300621095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0635db-7420-4c3f-9d6b-3ebf86f5e60d/nabakebafuzuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be26e2cf-ee66-4cf8-863a-726d29009c5c/feng_shui_2021_predictions_for_sheep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1027aad3-3c0e-4dbd-9e57-9d332d681b1a/55435674139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691adf2d-df57-4b04-bb91-c122043f992c/nascla_contractors_guide_to_business_law_and_project_management_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/170f42df-19f2-4edb-989b-825868903f32/motorola_mobile_radios_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38cd5cb-4391-4a82-842d-3973c741b87b/fuwerubasefepitavugaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b72eac9-9866-468c-b363-e0e05cdb9571/p90x3_mass_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e05a52-b79e-4a44-92bb-489381f64813/45910993830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab8b780-5d5b-4df8-8030-ed8704e0badc/61760809345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f07c4b-227d-4cfd-8569-69f90b749a12/37819187520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032883f5-da7b-45ec-8210-7dd0e0beb5f0/correlative_conjunctions_worksheet_with_answers.pdfIn 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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 4976 bytes
SHA-256: 1dea15c7829c2398e5529727667ba8764e0feb07c14f12d6277c38bcea9a9e99
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 11172 bytes
SHA-256: 39c2c68bc98624383d402a865e291f918156ad93801448376678bfc3e671136c

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