Malicious PDF — malware analysis report

Static analysis result for SHA-256 671051fa2392f20e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-08 06:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b9b7bf892ff4fd0304a8a3c06cfa40a1 SHA-1: 72ad52c17d6cadae3a24083b3020d3f263c2e0e5 SHA-256: 671051fa2392f20edffb280c783e10e505a3761e30ba4c76f8eb7598283453b8
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to contain a deceptive prompt related to a search query, which is likely intended to trick the user into clicking the external URI. The presence of numerous distinct hosts and a link farm heuristic further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=name+three+main+rivers+in+the+us PDF link annotation
    • https://cdn.sqhk.co/mikedeto/Ngejehe/26574587233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_6008faff8ce44.pdfIn PDF document text
    • https://cdn.sqhk.co/leloxoreje/dihjd8T/minecraft_new_mobs_mod_1._14._4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_601a5f9b22d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_6014e12bed6e7.pdfIn PDF document text
    • http://xobokalute.iblogger.org/fupavuxos.pdfIn PDF document text
    • http://pijakonojimuw.iblogger.org/movie_maker_windows_10_manual.pdfIn PDF document text
    • http://tivuximuliku.mygamesonline.org/what_is_a_statement_of_purpose_for_grad_school.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459055/normal_5ff30d2265d9c.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/93acb3a3-c5a0-4cac-865e-716f8c8aacaa/harry_potter_and_the_half_blood_prince_book_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937b5928-33b8-4a8f-a655-f15d2cd68571/tin_tin_cartoon_sinhala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc3df0b-1523-4f69-9bfd-8e76df3201fc/shadowhunters_the_mortal_instruments_full_movie_online_free.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/can_you_void_a_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45de789-672d-4ce2-bb45-300c0fdd0b1e/merchant_of_venice_act_1_scene_1_paraphrase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02139be-db7e-4852-aedf-6b462c0befd2/22875917107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e3b556-bf8d-4944-bc2e-f4819f5cc5e6/wahl_lithium_ion_2.0_trimmer_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b90238-ed8e-40c3-a62e-b8948dcbd9a4/lurixusojupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdf18db-1a32-4582-8b6a-376b8d32a848/real_estate_agent_course_vic_online.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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 4924 bytes
SHA-256: 4af7139b70ebd2d7140d0dda50be718ca657c30097dd35965ecb37472ae407e8
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 10756 bytes
SHA-256: cf87615625cba85c680f99d411d9e1c529e3a374fa937c95d33b47fdc7a5bea6

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