Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bcb8375979b1ab…

MALICIOUS

PDF

69.6 KB Created: 2021-03-14 20:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5697eec8d9991dd0577602e44dee83ef SHA-1: ef5c61d5763f9c2d767663f4116e8f8948d7ead0 SHA-256: 11bcb8375979b1ab722326b5e9063e0cf6c84dcce35e2d9615dc1c91e4a6bbce
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

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 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://pelibifir.ru/wix?keyword=pearson+envision+math+pdf PDF link annotation
    • http://dedefazofe.iblogger.org/49470121609.pdfIn PDF document text
    • http://mosuxemapawezi.iblogger.org/topographic_anatomy_atlas.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/managing_complex_change_matrix.pdfIn PDF document text
    • https://zezogilak.weebly.com/uploads/1/3/0/8/130874046/67e512246101.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/kuzav.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/estado_clases_sociales_y_educacion_en_mexico_vaughan.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/jozup.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/rx-a730_factory_reset.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/11-4_areas_of_regular_polygons_and_composite_figures_worksheet_answers.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/dewekatekikodow-pekometixumene-kozesuzifuto.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/cutting_images_from.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/f5e4cf9b-7d0c-4c9f-a6d0-db4daf2a0f29/marine_corp_drill_team_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d58e11f-8938-4455-aa2a-2472efa243ab/rugedine.pdfIn PDF document text
    • http://jogukazulani.epizy.com/12th_botany_practical_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b80d23-0d3d-4c2c-9779-f7ae89dc0c3a/porque_una_mujer_embarazada_sangra_cuando_tiene_relaciones.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/folekolifixapawasotogalo.pdfIn PDF document text
    • http://xazinipigoxowe.epizy.com/what_are_the_things_to_learn_in_advanced_excel.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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 5308 bytes
SHA-256: 4ea3801b41cccaabc5759832ffac6835d555d76fdea851f890fe9f562f41935a
font_01_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 11804 bytes
SHA-256: 18a62b1b3df262edb2d06bff790b385417c4cc8bbb2f599fc5915219acaab257

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