Malicious PDF — malware analysis report

Static analysis result for SHA-256 85287850fc7e9bf7…

MALICIOUS

PDF

76.3 KB Created: 2021-05-23 00:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4bd006bab774e786a2654337fad6a36d SHA-1: c8d3cf9417549f3032d41db482bf084586abe7fa SHA-256: 85287850fc7e9bf764a5a8d38ad410cbdf3b4b5de4cab977863510b6a8b67898
76 Risk Score

Malware Insights

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

The PDF document contains a lure about cheetah facts, which redirects to an SEO redirector URL. This pattern is indicative of a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=what+are+3+interesting+facts+about+cheetahs PDF link annotation
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/3253647.pdfIn PDF document text
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/6416832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5fc9437bef8d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_60654c7092e8e.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/fotipojon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601bba2071206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ff650fb04f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6048491259fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_605f3e80292cc.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/tawix.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/09772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_601fef3a87c4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/gre_math_practice_questions_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/82545757683.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/barnston_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/96714809434.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/gitevofu.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/assassin_s_creed_black_flag_pc_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852a6483-e026-4723-b65b-2eef7212197d/37309361779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6788651f-7739-458e-a9e0-48d476665e3c/guxokadugut.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/2019_census_online_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b52b039-ab6e-4eb8-9692-d6ce343bdee2/2019_ram_1500_crew_cab_long_bed_length.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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 5428 bytes
SHA-256: 5fa238b6390f0f61ad28917e6c89123c63ffa59b79d383429ceae8012097fa0b
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10664 bytes
SHA-256: 257292988dd0c4caa941290f0ba9a9924ccc83064b078a5a7e2da45e6bdf888d