Malicious PDF — malware analysis report

Static analysis result for SHA-256 be37672ff79eff6b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-23 17:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9bb9e723ae1807f9c0e81c711fdafa33 SHA-1: 81e5ddcfae3d9503b7493b88a5ee5241e1cbec6f SHA-256: be37672ff79eff6bc96a677e08fe5195892b16021bfb18548755991955167e83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jacksth.ru/123?utm_term=brain+chiari+malformation PDF link annotation
    • http://potawuzaj.medianewsonline.com/temporal_artery_biopsy_technique.pdfIn PDF document text
    • http://bixuvetojotenes.22web.org/ace_hardware_indonesia_tbk_annual_report.pdfIn PDF document text
    • http://mugatazujiririv.iblogger.org/medical_tourism_singapore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60219e565c733.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/virolojenep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_602414572b80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_601bc24bcbd68.pdfIn PDF document text
    • http://vokotavawer.iblogger.org/tear_soup_book_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_e1249d8b2bee4a2abb2e1b86ade2e027.pdf?index=trueIn PDF document text
    • http://jasesazolaf.myartsonline.com/duxezenuwedakijumi.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/new_balance_sheet_format_download.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_e6d71aff3eb44c208532535dd768fd26.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_1d9a7350222047f196d8598ab1dec5e3.pdf?index=trueIn PDF document text
    • http://fumoparasupob.epizy.com/ligapulifarewuxezuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b49dd3b-6804-425d-b4ad-755bd7aa49c7/dell_latitude_e6410_ram_upgrade_16gb.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_5212b3ad6dac4a2283dfc2dfe9eb52f8.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_1e3a3ed0be8e4c4d9d28127fd2eb5e3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/727cb1dc-2fc5-4114-a7f1-50dbb9508fd2/50692126593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df7d038-0097-484a-bf0f-29cf972393a3/1790312779.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/2472120853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eec3555-ab6d-49f1-b73c-db0bcfcaaf28/historia_natural_de_la_enfermedad_colera_esquema.pdfIn PDF document text
    • https://medlineplus.gov/brainmalformations.htmlIn 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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 4992 bytes
SHA-256: d284408d4fb4aac4b9d331a574f3188c7843aa327cc9a4bbad23a2fd0f04d749
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10212 bytes
SHA-256: 2e806621bb74da5cbbf7498cc8dbfca40c594ac9e21db5b2becf20a45dcbae3e

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