Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fb03ad8894659b…

MALICIOUS

PDF

83.5 KB Created: 2021-03-04 20:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 28159ad73d71b105c8b36b1b0d1ca7cf SHA-1: d837dee00adce4a7973811e19397ef88ef0411f4 SHA-256: 21fb03ad8894659bc1b261dea7827c3809fbaa084606f93016f89faa5d4c71a6
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including critical alerts for linking to known malicious redirectors and being part of a link farm on disposable hosting. The embedded URLs, such as 'https://dafemum.ru/wix?keyword=concreting+services+nsw', are designed to redirect users to potentially harmful sites. Although no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=concreting+services+nsw In PDF document text
    • https://cdn.sqhk.co/pafatewodoju/4ugheih/jalejexidugo.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/72791396449.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/cJugdhh/chisel_and_bits_mod_minecraft_pe_1._16.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/TgiMjjX/kododizifumebekaluxun.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/relation_and_function_definition_in_hindi.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/30201970153.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/bose_cinemate_gs_series_ii_troubleshooting.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/pSsgdli/videofx_music_video_maker_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_651c25fb780f4ff79d1b1c8fa1414f28.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_64a185c084f440479e5d0c94d6828f58.pdf?index=trueIn PDF document text
    • http://masutowuj.epizy.com/nelisavizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b9d270-39d5-4fae-8123-2ecc5290dd5c/29578259967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4717c2f-8f1f-4285-954d-9a16abcc51af/oral-b_pro_1000_electric_toothbrush_with_brush_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22efd56-9605-412c-ba0f-bd7bdbae93d6/all_american_pressure_canner_921_review.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/5333893146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c066636-2143-46f8-b8a3-fa90b82ef560/how_to_find_pilot_light_on_gas_fireplace.pdfIn PDF document text
    • http://pugalokero.rf.gd/vamomufefibeledegizixuzed.pdfIn PDF document text
    • http://dolasuwukino.epizy.com/cardiovascular_disease_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f42d0d0-a389-48d1-90e8-2ca35c575840/how_to_formulate_interview_questions_for_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cbcbc7-2fab-4043-a52a-fcc085fc2377/bazusawaxol.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/what_is_the_main_purpose_for_writing_a_business_plan.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_83b851e44284458aa1141f769a337097.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_eaac435296f74bc5a72cd2bcf85ec44c.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_23bf829f290a4a1aa450904e05d50c6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1c9d23-0eb2-4da0-9ef8-5a9e306785b7/3069234736.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 4688 bytes
SHA-256: bc50a9d189445c8b649b3e0f9229e13c71b3a8bb2be2d523c6c36205e973e890
font_01_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 10536 bytes
SHA-256: 1d26c1dd9517348d0f7a5bfe4d4f9487714684f31222cbbff5295d7327b6f190
font_02_sfnt_off00013284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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