Malicious PDF — malware analysis report

Static analysis result for SHA-256 861ddf473c1c23e0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 17:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4fa827b483f873114e590747f2323c17 SHA-1: 9b4152ab28d43bcd7e5b1e51c83ceaaf16eaa803 SHA-256: 861ddf473c1c23e07d013ffddec403ce9f3dfd579689b34c2e8769460099af9b
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 0.9995

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=2014+chevy+malibu+ls+manual PDF link annotation
    • http://mufosubofamar.mywebcommunity.org/mexeromidawewunufakexim.pdfIn PDF document text
    • http://stonersfranchise.com/how_to_be_a_good_public_relations_officernan2w.pdfIn PDF document text
    • http://armada.technology/adobe_premiere_portable_download6rhbh.pdfIn PDF document text
    • http://swiss-gear-top.xyz/hunger_games_book_chapter_1_summary7qyim.pdfIn PDF document text
    • http://loleveze.iblogger.org/91587911957.pdfIn PDF document text
    • http://xolixelov.22web.org/amazon_prime_amelia_bedelia_books.pdfIn PDF document text
    • http://lixuninipakimar.iblogger.org/shotokan_karate_kata_list.pdfIn PDF document text
    • http://tefozunamosolo.iblogger.org/alphabet_handwriting_worksheets_free.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/marvel_encyclopedia_download.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/likunadejexanuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_9974ee0b84b94ef89b6da0a4b768cfd2.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_c8b9942ee7244ebd8dd8ec2603f9631b.pdf?index=trueIn PDF document text
    • http://nufejubonuviwo.epizy.com/aadhar_application_form.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_b2c85046306340d0bdbbcd9c790e5299.pdf?index=trueIn PDF document text
    • http://xasonivuk.epizy.com/67778067393.pdfIn PDF document text
    • http://kafopozunu.epizy.com/61149415698.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_e6ca57de038e405c9390bcfda6f80bb0.pdf?index=trueIn PDF document text
    • http://kasisexa.rf.gd/tftp_server_windows.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_531139e2d4944279884e6d5d33f83918.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_564c2a1505c94ef49fc10578575810c4.pdf?index=trueIn PDF document text
    • http://sikofus.epizy.com/reliability_centered_maintenance_training.pdfIn PDF document text
    • http://nudoritane.atwebpages.com/html_to_api_php.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 5564 bytes
SHA-256: 8569245811f3b8134a2feba2567ae10383758a6d3956feafe1bea2da892401b2
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 4396 bytes
SHA-256: f31133c0fc48f3176d80b6e30834c71557a3035f46f9b866ada0de7220d4af33
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10668 bytes
SHA-256: e5c1a56c372174bcea561d3a4f503701d14e35e80ec82565084311b6083c1bfb