Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f69d7d872cb15b…

MALICIOUS

PDF

82.1 KB Created: 2021-06-01 07:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82166b4285ee994541846e71391f011b SHA-1: 5b8ee1be609c8ac71a4be697239596d48923bb70 SHA-256: b8f69d7d872cb15b2c269a5f08b01057add1e748cceabb45b8eeaf688e595181
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of a malicious document designed to lead users to external, potentially harmful, content.

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://huntic.ru/pbw?utm_term=ielts+reading+test+practice+pdf
    • https://cdn-cms.f-static.net/uploads/4492575/normal_60435958e8cd3.pdf
    • https://static.s123-cdn-static.com/uploads/4427828/normal_5fc79d68029b3.pdf
    • https://cdn-cms.f-static.net/uploads/4466996/normal_601dc2296779d.pdf
    • https://fuvalodonof.weebly.com/uploads/1/3/4/0/134012518/e1c7b.pdf
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/4071ecaf461ec20.pdf
    • https://cdn-cms.f-static.net/uploads/4372967/normal_602a18a443ced.pdf
    • https://cdn-cms.f-static.net/uploads/4373516/normal_6035de9ebcc98.pdf
    • https://pudamokanijufe.weebly.com/uploads/1/3/4/5/134524046/rolaxulamafiko.pdf
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/sepirejufiwaxi.pdf
    • https://cdn-cms.f-static.net/uploads/4411220/normal_601d3ba5e559e.pdf
    • https://cdn-cms.f-static.net/uploads/4411498/normal_6062c3486265b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rujuboxu.pbworks.com/f/what_is_ews_certificate.pdf
    • http://bupataved.pbworks.com/w/file/fetch/144419568/how_to_connect_veryfitpro_to_watch.pdf
    • https://uploads.strikinglycdn.com/files/28676ce5-bb46-4312-a4fe-3d3e8261669c/principles_of_microeconomics_9th_edition_n._gregory_mankiw.pdf
    • http://fubajulak.pbworks.com/w/file/fetch/144426567/skyrim_paradise_halls_reborn.pdf
    • https://uploads.strikinglycdn.com/files/de6cf88e-d930-4748-9464-a23049465853/pepufufimezolaxosawiw.pdf
    • https://uploads.strikinglycdn.com/files/ddc1de6e-efcd-48f3-add9-757e24ab902a/alkaline_diet_for_beginners_dr_sebi.pdf
    • https://uploads.strikinglycdn.com/files/46d89c87-e616-4e46-9062-9d22a06deebf/sejefujuxawe.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144419193/new_products_management_crawford_di_benedetto.pdf
    • https://uploads.strikinglycdn.com/files/00fe34f0-996a-46c3-8ab5-0e30a589167b/present_perfect_simple_or_present_perfect_continuous_exercise_1.pdf
    • https://uploads.strikinglycdn.com/files/089addda-f084-4f81-a9a5-ad59a09f460e/aprendizaje_basado_en_proyectos_abp_definicion.pdf
    • https://uploads.strikinglycdn.com/files/3e022f5e-b387-4f4a-aa30-773e350c3329/ligujurowadanuragudir.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_off000102ee.bin
81b0c106b5ec29c322fb7885e2528537a1d91e27bf37caeac00883f803e6a6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 5260 bytes
font_01_sfnt_off000114e0.bin
633c429a9f87d240331d09007c4f0a1a015bd17b2ff7c435270ff2c0b1ae3c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 11248 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.