Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e9873c148aa86f…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 10:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2496534a90511094e5ede8f37b075079 SHA-1: 2958a739714513f8e4b350805db65fd8da36794c SHA-256: d1e9873c148aa86f87ec0f3461a5fdd95e8c3021c8445935918ebe6325dd5880
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO poisoning attempt to direct users to malicious content. The primary malicious URL identified is 'https://dugedepap.ru/award?keyword=oxidative+stress+and+diseases+pdf'. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=oxidative+stress+and+diseases+pdf
    • https://cdn.sqhk.co/vafodagusun/igjkwii/call_of_duty_warzone_map_locations.pdf
    • https://cdn-cms.f-static.net/uploads/4497110/normal_600b77a526f57.pdf
    • http://xemizawufogutuf.scienceontheweb.net/fire_god_ps4_price.pdf
    • https://cdn-cms.f-static.net/uploads/4472776/normal_600aa9359d22c.pdf
    • https://static.s123-cdn-static.com/uploads/4370072/normal_6005492baeb97.pdf
    • https://cdn.sqhk.co/rijomawonuj/j99kjO3/hovercraft_takedown_online.pdf
    • http://giwitap.getenjoyment.net/cuales_son_los_mejores_trabajos_pagados_en_estados_unidos.pdf
    • http://lomizagin.iblogger.org/vetekodopepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_1c9c671247244c8ab540271ae86b97b0.pdf?index=true
    • http://nisetekotixob.myartsonline.com/what_is_the_potter_house.pdf
    • http://rawuvotatu.rf.gd/30067907727.pdf
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_917b8ebe087349589fa0d474c802d03f.pdf?index=true
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_1a8c476d071e4b44baca449ba175e047.pdf?index=true
    • http://wesatume.atwebpages.com/the_encyclopedia_of_modern_bodybuilding_free_download.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_10036b0a613949a7865d42b0cd916e5d.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_31b066c5281d49eea61b4467f4619c5f.pdf?index=true
    • http://liroporuki.myartsonline.com/demuzupuripapunojisa.pdf
    • http://buwomir.epizy.com/54133656301.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_e456d86e88a2417bba640b4c74f57201.pdf?index=true
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_4e150ff7481e45f8930da3e851beec78.pdf?index=true
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_11ff733ff75a48f1a56f91fd65dbb3cb.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_off0000eda2.bin
4a0c17e8b827f0c0ac395489194aea2ae54f06258e2a7aca086ef92ce7bd43e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5160 bytes
font_01_sfnt_off0000ff46.bin
f9cbc6748f711067529910edcda08e6e7e80cc754fe4404e542e25091e41005f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 9772 bytes

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