Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c4e450469ef21d…

MALICIOUS

PDF

138.1 KB Created: 2021-05-05 07:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e53cdcd4e5e694b7a9640027c35539d SHA-1: 4b030656c595009dad00118cd453e17e3a943f87 SHA-256: 16c4e450469ef21d47ab99fb3f3a8c6d08e95fa54a3d472b7082f032dc94e10b
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to suspicious domains, including one that is part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://midufefew.ru/strik?utm_term=fender+mustang+iii+v1+firmware+update PDF link annotation
    • http://indohealth365.online/73339276740fhbxp.pdfIn PDF document text
    • http://mavpa.fun/sejudepetufavofijakilagov97fz.pdfIn PDF document text
    • http://ek-arenda.ru/90789901650rrxkb.pdfIn PDF document text
    • http://hookup753.fun/76558304410tlqu5.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/multistage_centrifugal_pump_parts.pdfIn PDF document text
    • http://italy50wow.pro/project_coordinator_interview_questions_answersxqkup.pdfIn PDF document text
    • http://sputnews.com/cisco_dta_170hd_diagnostic_menuzk4ps.pdfIn PDF document text
    • http://remontnatali.ru/the_chrysanthemums_by_john_steinbeck_literary_analysisdh676.pdfIn PDF document text
    • http://xumugawejal.scienceontheweb.net/easy_piano_sheet_music_book.pdfIn PDF document text
    • http://fruittea.space/contingent_liabilities_are_disclosed_in_financial_reportsj96ib.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/how_much_should_housekeepers_get_paid.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/99237835143.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/online_to_excel_converter_full.pdfIn PDF document text
    • http://look-hotel.com/firevazilifapafudysl.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/2b9307dd-7b70-4688-9670-4b084915dfba/black_boy_names_that_start_with_the_letter_j.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843f28e3-0f8f-401e-8a43-50f7475a745f/cheats_in_warcraft_3_frozen_throne_pc_local_area_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d277028-9585-4269-b6a6-1531a078fc00/poberutefopalazava.pdfIn PDF document text
    • http://sinizanuj.epizy.com/american_college_of_obstetricians_and_gynecologists_guidelines_preeclampsia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9983336b-169f-4bbd-ae0f-032bc5074134/pioneer_vsx-819h-k_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbe4748-fde6-4289-b53b-a97bfe0bc70b/oracle_pl_sql_advanced_tutorial.pdfIn PDF document text
    • http://vidobif.epizy.com/how_to_grow_and_harvest_sweet_potatoes.pdfIn PDF document text
    • http://fakulolipokate.epizy.com/what_is_the_word_availeth_mean.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/fmea_guidelines.pdfIn PDF document text
    • http://kalapifupedafog.epizy.com/linksys_ac1600_ea6400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccc2b63-a17c-460b-8c4d-360577268ffa/rupoxon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd188c1-9e39-40bf-a654-0a12e9f4a0dd/principios_de_la_economa_de_movimientos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17c0067-d507-4e19-ab87-2ea7bca95031/rule_based_thinking_ethics.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_off0001c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C87D 4448 bytes
SHA-256: f4f4736e63364d1abe57838a84e08090ff4b4966c431d6028729f929e508b1d1
font_01_sfnt_off0001d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D847 5488 bytes
SHA-256: ea96d089902384c2a140e47584cb8d7624745d3e69d5f257377b0d81a7b983cf
font_02_sfnt_off0001eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB00 13900 bytes
SHA-256: c6078cea6659c14a26b4c5d2cf5ef1c0042d69729f575e5a47afd9d43ad76193