Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c455e5ac85ced0…

MALICIOUS

PDF

76.0 KB Created: 2021-06-10 15:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f54c72eb6a1c5b9d30f79c318780c64a SHA-1: ca07ef195ec047e33a1e8dd1bf30da1c6b301e10 SHA-256: f9c455e5ac85ced0e9991d87e2f786566ea9d94d8c84247a3512c6cc590c9d06
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'Amazon prime video apk for tv', suggesting a lure to trick users into clicking the malicious link. The presence of embedded URLs and the overall detection by multiple security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/pbw?utm_term=amazon+prime+video+apk+for+tv PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4c4900-1023-4c5c-b0e2-0ac4e5d43471/how_to_get_psa_marriage_certificate_in_sm.pdfIn PDF document text
    • http://bopezijitex.pbworks.com/w/file/fetch/144609009/polysyllabic_words_phase_5_worksheet.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/1858556387.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144506715/65121350552.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144709515/widotasuxe.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144468354/bomba_presurizadora_munich_modelo_bp-1209_manual.pdfIn PDF document text
    • http://ribejigub.pbworks.com/w/file/fetch/144870183/wizards_of_waverly_place_the_movie_alex_vs_alex_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee59e27-2c00-4855-9b2c-ba75f209f297/how_to_operate_a_kenmore_sewing_machine.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144494505/52830934112.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144480807/is_proheart_safe.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144655581/89561572823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d248a44-8e6e-4c2f-bbd0-7473e394b385/petuvo.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144818364/john_deere_240_skid_steer_manual.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144506982/solving_linear_equations_differentiated_worksheet_tes.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144661677/essentials_of_business_communication_free.pdfIn PDF document text
    • http://lakomop.pbworks.com/f/35366728281.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144537909/5704845895.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425343/wubamad.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144747276/anatomia_quirurgica_cabeza_y_cuello.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5ed84b-3b38-4807-8a62-db8527566c25/11881152065.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/f/gizmos_photosynthesis_lab_worksheet_answers.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/f/29537615747.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144604842/what_does_the_word_oceanology_mean.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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5140 bytes
SHA-256: 0f07e87b9b27bc9b30314218b886e7fd6436468a97b9a476ade75cf4d8e50626
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 11452 bytes
SHA-256: 2eeb20f8f111baad90815a621d5d1a88666829ac3bcbcbac799f1e60951b910d