Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc9643b22af27bd…

MALICIOUS

PDF

150.0 KB Created: 2021-06-01 12:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7b53b4cc3c13cd3a9701b3f2e0f53191 SHA-1: 98c2a50a428a278d4346dbb4ce9c13c90f085411 SHA-256: 0bc9643b22af27bd4d88aead921616989436de6b5adf239d9aaf8757fce2f7a8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jumiwimov.ru/123?utm_term=agastya+samhita+malayalam+pdf PDF link annotation
    • https://kirikunekev.weebly.com/uploads/1/3/4/7/134737840/aa06409effad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5ff2498600ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_600a9440ee55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_604512d8dd490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fcbf9b6b78fb.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/8dab893c8c9ac.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/bewiwivadawoz-xegijitiwene-mugisukewowugu-sepaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367305/normal_6009ac12af552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajozote.pbworks.com/f/unseen_passage_for_class_4_with_questions_and_answers.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/printable_color_pages_for_kindergarten.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/twilight_saga_all_part_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144431463/1999_ford_ranger_xlt_4x4_4.0_towing_capacity.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144413169/minecraft_13.0_apk_indir_cepde_cretsiz.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416793/common_sense_thomas_paine_quotes.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/winzo_gold_hacked_version_apk.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144419796/how_to_calculate_molar_heat_of_combustion_of_phenol.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/sepuretaxikuwogo.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424767/what_are_the_different_types_of_intermolecular_forces_of_attraction_from_strongest_to_weakest.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/dieta_de_la_cintura_del_doctor_bolio.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/8214066676.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/f/what_are_the_four_effects_of_baptism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3753def-b5eb-45b2-843f-2590e2c8d7ab/75071244492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec442951-6b46-41d0-b4c7-68106bfc6ecf/difewafi.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/1448114741.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F795 5452 bytes
SHA-256: de3dabd0788d4a436a5a418c31175390d072ace5492ba94b5cb7af69a0936bf3
font_01_sfnt_off00020a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A0E 14212 bytes
SHA-256: 88fc24b509f02a69613eb66946bf62ae45b0c524ad94943cb0c190ed80d0f4b7
font_02_sfnt_off000234eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234EB 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d