Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e86998eafc93873…

MALICIOUS

PDF

77.2 KB Created: 2021-06-02 02:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77579f370aa89f15ea419127e053c037 SHA-1: bda68d91208a8b09b24cba96afbbe0f485288f5b SHA-256: 0e86998eafc9387399a2f63a0ae9b6660642f9eeb0e45a52bd7a751342a81bf0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=arabic+keyboard+microsoft+word PDF link annotation
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/23b909.pdfIn PDF document text
    • https://xovoxabazilepot.weebly.com/uploads/1/3/6/0/136054719/21d9d1d8d952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_6048a8fab5fcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_605d7cd42f309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_603c42bb932a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_60527a6bc6832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_603d2b16e6a08.pdfIn PDF document text
    • https://temazerezeveleg.weebly.com/uploads/1/3/4/7/134763385/6400521.pdfIn PDF document text
    • https://dajitogaxafolix.weebly.com/uploads/1/3/1/1/131164176/momak-wiver.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/ce31b670-7d55-4684-9168-30b0544b161c/msi_970_gaming_motherboard_cpu_cooler.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144459423/imgenes_de_los_10_mandamientos_de_la_iglesia_catlica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f666cf9-ca6a-4f95-85f8-eed419820acf/gawisamabajidapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17008824-2e4e-4cfe-bee5-222a65047e33/marca_personal_para_dummies_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d62de9-fc11-4e9e-a2ae-8864b9fede02/jawbone_mini_jambox_pairing_mode.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/68024950081.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/zulenumelopiwugugorosom.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144481296/how_do_you_use_ordinary_products_for_acne_prone_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ad53f0-b830-4b35-b7ce-41c92a52b583/maxi_cosi_mico_ap_stroller_compatibility.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/70439460042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f996e2-75ed-4ddb-b816-13b326051159/assassins_creed_rogue_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8a8ad1-4fee-40c3-b83e-967d7cc12669/24176283467.pdfIn PDF document text
    • http://zudilazo.pbworks.com/f/fowibipikegalum.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/xotolosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85234c3-9f33-4332-b484-e6d8d4809bd1/pentair_superflo_variable_speed_pump_manual.pdfIn PDF document text
    • http://pusavivo.pbworks.com/f/diablo_2_lod_1.14_d_hd_patch.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144468360/how_to_test_car_ecu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1013341f-ad24-4372-931b-bbbaf9196ab0/vurawujilifesasil.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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 5520 bytes
SHA-256: 48600224790c35bbf5b9279074a8531b97cce37cb3c86855e0dd024bcc79577a
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 10824 bytes
SHA-256: 43d0d152d6dde79971433570e9d69b10065d12d896efc9212909bd9e90845fb5
font_02_sfnt_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b