Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caf6cbbfd4e4e51…

MALICIOUS

PDF

91.0 KB Created: 2021-06-03 00:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93ebf151baef11ca8605860d67542d01 SHA-1: 593210c4adc8c12e3b0a4db36b412efd3abce5fe SHA-256: 8caf6cbbfd4e4e51bd7e1dfb12313bb37e73bb76cb2a0d143c77c95b78e2472f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to distribute files, and the presence of external URIs suggests an attempt to redirect the user to malicious content. While no scripts were extracted, the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://vilenefex.ru/123?utm_term=kid+halloween+movie+trivia+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4382421/normal_60b320143352f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_603ad6a9bf11b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_606b8d2994e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_6010eec800703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_601cb7bd2cc6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_603064f01051b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_604bad3bab308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_6002487535fbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144500841/earn_to_die_2_mod_apk_1.3_unlimited_money.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/4860218142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d15133-74f3-4efd-88e8-410956b7a087/how_to_write_a_story_arc.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144439077/mesekogelobixuguparotilet.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144477342/how_do_you_check_the_transmission_fluid_in_a_2009_nissan_altima.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144523722/15403442422.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/f/piggy_boom_mod_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea747a82-e0fb-4d30-b73e-57b9c8f8c95b/tijibimepizir.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144496575/lolututu.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/gobotagalarug.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/que_significa_sonhar_com_a_cara_desserto.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144445341/dewalt_cordless_drill_owners_manual.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/cules_son_los_reactivos_y_los_productos_en_la_reaccin_de_fotosntesis.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_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 5312 bytes
SHA-256: e745ff939101cfa09946ad0a38e1a797dfb4b43df9e841074c8d1d3402944f05
font_01_sfnt_off00013691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 11932 bytes
SHA-256: 08d16564cb500d14cf3ca11a8595582b6a32b0357aa1749190b3479ec011e99d

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