Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd540159ffcd20d8…

MALICIOUS

PDF

124.8 KB Created: 2021-03-16 10:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e78125c2149958d7c3e8ada576b0dcb5 SHA-1: ed8b5bb9705b0e5030ee68ad0b4eb48d00025198 SHA-256: fd540159ffcd20d8e7b298b301e001db5d89ac9f622a4d13f0a1c99e4faca790
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=fatalism+definition+pdf PDF link annotation
    • http://suboxobuwofum.iblogger.org/2020_cadillac_sts_repair_manual.pdfIn PDF document text
    • http://fozujam.iblogger.org/2128430718.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/centech_5_in_1_power_pack.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/xupurekakisumaze.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/brother_tn_630_wifi_setup.pdfIn PDF document text
    • https://bubigijezifaju.weebly.com/uploads/1/3/1/3/131380429/30564.pdfIn PDF document text
    • http://xezobofelupazat.22web.org/how_long_can_animals_go_without_oxygen_before_your_brain_dead.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuforewebub/coordinate_grid_worksheets_grade_2.pdfIn PDF document text
    • http://sapirilogive.epizy.com/intex_sand_filter_pump_for_sale_near_me.pdfIn PDF document text
    • http://lefigop.rf.gd/ladies_formal_attire_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/runapukozu.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/estilos_de_aprendizaje_auditivo_visual_y_kinestsico.pdfIn PDF document text
    • http://sogefotatuledis.epizy.com/catharsis_in_oedipus_rex.pdfIn PDF document text
    • http://rofizarikapa.rf.gd/biomes_and_invasive_species_worksheet_answers.pdfIn PDF document text
    • http://fatofugo.rf.gd/lapegoxudod.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/95084209533.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/cursive_handwriting_worksheets_for_grade_3.pdfIn PDF document text
    • http://kexomun.myartsonline.com/showtime_rotisserie_turkey_breast_cooking_times.pdfIn PDF document text
    • http://wanikokod.epizy.com/temuvuj.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/belly_pork_cooking_guide.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/charlie_and_the_chocolate_factory_online_book_with_pictures.pdfIn PDF document text
    • http://pugatexekar.rf.gd/judufefusafixuwirej.pdfIn PDF document text
    • http://tavopaku.rf.gd/mhw_ancient_leshen_solo_guide.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/liridusebogugelororivawu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CED 4832 bytes
SHA-256: 73fc4d4a20a7a5149e3ba239e9bf9f8b617d195ae3aed8ecedf96d9e1c9cedfa
font_01_sfnt_off0001ad47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD47 12316 bytes
SHA-256: 82a648d3ec5f28012c1e88e72e13195f89add2ad2863b03b71e432fdc0ff22d0
font_02_sfnt_off0001d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5DD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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