Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4349499a956d2b…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 20:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 704df0bf88ef42595c6ea781dac03462 SHA-1: 177da4264140cc3674a764ba4ca340ed6d2522c9 SHA-256: 4e4349499a956d2b44d39459e7d1a8e2ae70f0fddca0c5ea346ba192ecfd97c7
156 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 0.9998

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 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.
  • 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://nipisod.ru/123?utm_term=critical+care+medicine+submission+guidelines PDF link annotation
    • http://tibuwajeta.22web.org/749392608.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/dumojesukozapom.pdfIn PDF document text
    • https://tujazemedup.weebly.com/uploads/1/3/4/4/134473975/doxasoxorarij_jezij.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/zenusa-xawujamogul-laled-gezubelanixej.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/1987de0247a.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/1935c48c-c1cd-4af2-81a6-29438bae7821/movosubawufapejulalolurad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4e250d-6903-43d7-9d5b-e319cc6c3569/behind_closed_doors_short_film_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/8434750704.pdfIn PDF document text
    • http://bupozul.epizy.com/how_to_remove_kitchenaid_beater.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/mi_a3_android_one_gsmarena.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/33425837538.pdfIn PDF document text
    • http://leguliwopubagu.epizy.com/59726677858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7e8a5-ab55-40a1-b315-458ca5604c09/nj_driver_license_knowledge_test_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/reiner_and_bertholdt_transformation_dub.pdfIn PDF document text
    • http://gimazabovatefik.epizy.com/leadership_lessons_from_the_life_of_david.pdfIn PDF document text
    • http://vawanumezal.onlinewebshop.net/16547633525.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/us_history_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b255aa-e418-4fd4-82bc-9f9f9424f0da/how_to_resolve_team_conflicts_at_work.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/pavekakogufanogusitis.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_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 5304 bytes
SHA-256: 08d3990a46f7c1aae19cea298331de95af244951e4aeee3fedd469f611e6d634
font_01_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 12760 bytes
SHA-256: 8400c5a9ce4ff6bd58cffde97e34d7db6d38f7152b4f095e16e77df89d72fdfc

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