Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ef3f5f6df4670f…

MALICIOUS

PDF

70.0 KB Created: 2021-03-02 11:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: daca525b50a4abddcdee1d5e3e1d4bb2 SHA-1: 00f8fba8c6330c1d33dbc4b141cc8406f518c49b SHA-256: 99ef3f5f6df4670f046f47ecf43cca14020c2ba5aecc0e9997ef0c88bea4e252
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=worksheet+compound+complex+sentences In PDF document text
    • http://requiredjokblog.com/duzuluwofototebajegakanb0ar1.pdfIn PDF document text
    • http://reactivaperu-2020.com/turbat_balochistan_weather_reportzjkw0.pdfIn PDF document text
    • http://rawajajeko.iblogger.org/tadivadalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422150/normal_5fe6777160856.pdfIn PDF document text
    • http://mozodulo.iblogger.org/besharam_film_all_song.pdfIn PDF document text
    • https://zajuzuvo.weebly.com/uploads/1/3/4/4/134474050/8203131.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/1080c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_6002bbab00254.pdfIn PDF document text
    • http://redtea.space/maths_genie_bounds_worksheetcy9x3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530578/normal_5fcd7b6825303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_6024ad5961d92.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/tovivevari_dilev_gofiviko.pdfIn PDF document text
    • http://ing-cliente.com/ablls_assessment_reportxap04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_603b47454283e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_603cc9d068671.pdfIn PDF document text
    • http://pobasomitiji.22web.org/canada_child_passport_application_renewal_form.pdfIn PDF document text
    • http://load-bcp.com/felujafitu0187p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480589/normal_60048713216dd.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/7652382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulalanetoki.epizy.com/whatsapp_baixar_para_android.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 5248 bytes
SHA-256: 7be596e1a0d5f45d14e9fd9b6230d9a07055c9665d1379bb4fa461b91cb50f94
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10160 bytes
SHA-256: 119abee8c7922ddf9e60b8e16c3e9fc68244cb192956516fb997786ba1668164

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