Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f61bfcfc48697…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 08:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 11e2e035f896fa5f48182d0ee89c4640 SHA-1: 5683a7fc6059127f682a7c4c1bf25cb85878e7f9 SHA-256: 266f61bfcfc486975eb89b8fdfeb4b1dd895a3de1e6360a5c98de22972d8d17a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/wix?keyword=hamilton+beach+7+qt+slow+cooker PDF link annotation
    • https://bimuwalunamen.weebly.com/uploads/1/3/1/3/131384226/rurakejinudaf-muwapezabiw-mitufejavun.pdfIn PDF document text
    • http://gugelomem.22web.org/varicella_vaccine_information_sheet_cdc.pdfIn PDF document text
    • http://feboxazatoran.22web.org/automann_suspension_catalogue.pdfIn PDF document text
    • https://dilozekilofak.weebly.com/uploads/1/3/5/9/135968706/5067784.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/vejajiwomu_warimire.pdfIn PDF document text
    • http://xotekalulomeb.iblogger.org/26558462509.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/kalaxegopo.pdfIn PDF document text
    • https://tuwureliw.weebly.com/uploads/1/3/4/1/134108737/b279f5d.pdfIn PDF document text
    • http://pornbustyvids.com/duvegomenokuwataloroz2ai6.pdfIn PDF document text
    • https://pimobepasad.weebly.com/uploads/1/3/5/3/135347335/6153322.pdfIn PDF document text
    • http://bluebadge-support.com/73899154706zvmlv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdeeb92d-a62f-4bc1-a381-4abe44f184fb/62440557844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb96629-4b20-4c2b-bbde-260a1052a60d/49328038937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd060981-07e9-44be-ba90-96703a5d8b19/ruger_p95_trigger_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06185b9e-ab9c-4d94-acf0-6eee0ab41377/technical_analysis_and_stock_market_profits_by_schabacker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0246651-6f40-43e3-abde-5985a679f89d/bob_harper_recipes_jumpstart_to_skinny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227b11c5-aad8-4f60-9739-35c22b30a52f/is_there_an_it_chapter_2_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39d1cd6-dc46-4f14-bc84-43ad78c4dafc/tcp_ip_wireshark_network_analysis.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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5504 bytes
SHA-256: 201319a11264a6cf1626b34b4656765811119c5405a366c849074b89741bdf0d
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 11272 bytes
SHA-256: 171f4be710e39ddc0424c935af381f4fc31d0a5e384ed65c8964328d02485ab7

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