Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1b14aff0fa4d07…

MALICIOUS

PDF

80.3 KB Created: 2021-06-11 16:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e5a8190825411b30a8424bb7d396e256 SHA-1: 56545d2d4ff69f208401b8a98fbf228eb83e0c3f SHA-256: bf1b14aff0fa4d0758b2ed3253806811435cec335df8cb4d4bdd0246fd98710a
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external URLs, including `https://coretry.ru/pbw?utm_term=numero+de+serie+corel+draw+2020+mac`. The presence of many external links on disposable hosting suggests an attempt to distribute malicious content or engage in phishing activities. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://coretry.ru/pbw?utm_term=numero+de+serie+corel+draw+2020+mac PDF link annotation
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/6725c470d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6057e2d975b2f.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/lajenipebopid_muxifirila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5ff75b7e9b82c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_6055f2ef48b24.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/6e700cff-8933-4a6f-bec0-1a3af7cb8876/what_is_the_significance_of_the_half_blood_prince.pdfIn PDF document text
    • http://botinuba.pbworks.com/w/file/fetch/144609132/libro_de_susana_rosales_fundamentos_de_enfermeria_bibliografia.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/dnd_53_players_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d9bc61-30c5-4da3-b1da-3defd37475b2/tales_from_the_shadowhunter_academy_audiobook_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712253ee-5ef7-4d07-ae30-073b22a96453/gerimemoxulekagiruxagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca129fc-e39c-40b8-a9f0-9ccb5e1ceb85/how_to_start_craftsman_3000_psi_pressure_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f882dc46-89ad-42dc-aff2-e5bb682a0a73/sumanavonaloxanaxaseru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37b4e69-d836-4d4c-896f-58dda9d7fd11/husqvarna_460_rancher_carburetor_removal.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144524388/root_words_worksheet_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31c0bfc-b7a3-4d58-84de-4545c27701b3/rezo_en_familia_de_la_corona_de_adviento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc46216d-8223-4800-ac04-8cf958253e5a/misogadekesomurulul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d9053b-0e11-47ee-96d9-a40794817ca7/how_to_open_a_sentry_safe_without_the_combination_and_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafe9a05-79a4-4aa3-b53c-6e489b16ed9b/final_fantasy_8_strategy_guide_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f15fbba-1059-41a9-89c2-bd7bcf1e85d0/lutopagoketalipozoperiwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380a05de-3489-42e6-8e99-2f8428a2335a/lijev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f5a222-786a-49a8-9774-ec1cef37c20a/52597224232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e79c444-a4bf-4895-8eef-dff8dd7f3db4/jokepopugimusediwino.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_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 5420 bytes
SHA-256: bf8cdd8de39eaa7a698548e571b22e59556b5d38cd655e844f3c4a399f65aade
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 10840 bytes
SHA-256: 2cbd760b593f4745260aae395124ae910b4fe293f11b243a38d56afbcf7e2a5e