Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9c5b5bbccba156…

MALICIOUS

PDF

76.0 KB Created: 2021-06-10 15:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fba25e3e5265173712dca3699369d9de SHA-1: 2de8f00a8d261d94d435dcc5ea61c9094ae02c05 SHA-256: ab9c5b5bbccba15624c28eef6bd929da4aef3eb97b409e1cb7ce037f4ff88e42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/pbw?utm_term=koplayer+windows+7+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485927/normal_60203565d71d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ffb541f59cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5fd7efaf76bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_601fb169a5dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_6031643f2920a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fdd2fc7c6bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_6056767a321e1.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/a64b3757-dfd2-4956-9ed4-561cef2ed4b3/rapid_gun_3_friv_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5644e44a-16a5-428d-ab86-e8df8e891a38/chhota_bheem_damyaan_full_movie_in_hindi_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78442ca1-6aea-40ef-9193-bd4b69daf7f7/97341904561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433c617c-3d10-4d2d-bf85-8234c1c6b2fe/la_vida_de_sabina_rivas_pelisplus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1ac093-7610-4bc7-9033-22a4917b98a0/microsoft_excel_math_formulas_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adefbee0-60b7-4d34-b31b-823e0c857669/xituloxema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25e2d29-e430-4415-880d-8e6ac3c84392/63710567147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9b96ca-8e49-4277-bf24-50f76ebbb265/how_to_stream_with_elgato_hd60s_xbox_one.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/90239644931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72762cd6-eedb-4df3-bd43-e7877489a4f0/fewibumubiworox.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/ayurvediya_garbh_sanskar_marathi_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b2cd70-aeb5-4b0b-b2f9-a367f9e60fd4/computer_organization_and_design_arm_edition_the_hardware_software_interface._1st_edition.pdfIn PDF document text
    • http://najajadux.pbworks.com/f/crunchball_3000_unblocked_games.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144805926/blackpink_summer_diary_in_hawaii_episode_7.pdfIn PDF document text
    • http://sonubugu.pbworks.com/f/how_to_get_free_tp_medals_xenoverse_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025fc3cf-49bf-42bd-bae2-5d8069d0af2e/what_does_charli_damelio_order_from_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10816eb8-239d-444d-9e4f-1b8b9e801af2/zinojakepenumavitub.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_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 5632 bytes
SHA-256: f09bbeed9f1d3f1c1d45cc220b82e6d138e99d1756769a8d66cdfcb43232f1f0
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 12104 bytes
SHA-256: 6e50fbbf6aab4b2d25cfb9908d58d4548a23dfe577ee98c1ffadef399aef1133