Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4b90b5321930ca…

MALICIOUS

PDF

82.1 KB Created: 2021-04-07 21:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 05f6e9bb5a081729f6d80f6ac03e4f59 SHA-1: 6e5aa6e3f916f140251c8532284aa87d29ee376f SHA-256: 8a4b90b5321930ca03577b541393091a1a2ac234afd25f997f581a391722e7e7
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://jumiwimov.ru/aws?utm_term=1st+20+cube+numbers PDF link annotation
    • http://slampochka.ru/44561552489206te.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/cggNji7/wildcraft_animal_sim_online_3d_play_free.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/je1fFif/63734499175.pdfIn PDF document text
    • http://eeuuurrrrr.space/jikidulinusumma08.pdfIn PDF document text
    • http://seamanygau.best/zombie_vs_fruit_plants_onlineapaia.pdfIn PDF document text
    • http://gladkoe-telo.xyz/kafumaguwiwarimuxetametn00mv.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/how_to_solve_fghx.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/toyota_corolla_altis_2016_for_sale_in_karachixl0i6.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/comparing_and_ordering_decimals_worksheets_5th_grade.pdfIn PDF document text
    • http://instasale.company/fisica_cinematica_ejercicios_resueltacf8s.pdfIn PDF document text
    • http://disconto50.info/agile_software_development_with_scrum_series_in_agile_software_developmentv3s7j.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/ijeieig/muruborotoponagalogob.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/barium_chloride_msds.pdfIn PDF document text
    • http://edalovert.xyz/70952569556icppk.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/fusionner_des_en_un_seul_fichier.pdfIn PDF document text
    • http://bogplaktnc.fun/number_theory_npteli887v.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/hBSSGOb/oxygen_concentrator_price_in_nepal.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://uploads.strikinglycdn.com/files/ecfcd80f-c03e-4906-acc2-4af4a4c848aa/ponupafupupulaju.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/tajuwamos.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/built_environment_books.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/cancion_catolica_saber_que_vendras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d74a26c-7c37-4af4-ba7e-d8b5d34c44e3/division_properties_of_exponents_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255045bf-3c9b-4cfa-afa1-967f4c15c9c5/sustainable_development_goals_deforestation_data.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_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 4800 bytes
SHA-256: 229e9e10fd46a7d8f133d4220a7141f3903373949816308e000bfff25a729fe3
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 11424 bytes
SHA-256: 707800d0c77ee148e5923dd0072160ced2e4289044374a0c9eb2fa767ed77bc0
font_02_sfnt_off00012d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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