Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbae06b43c7cb3b…

MALICIOUS

PDF

81.7 KB Created: 2021-04-05 03:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4f034ba57cd957c2adc92345c0dbfc SHA-1: 125cf256490a874e1ec0a6ad414ade67af746b36 SHA-256: 7bbae06b43c7cb3b7bb82be4f6d58e90c6a7327f9202c270ba5c2ebb1b5cd5e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection. The ML classifier also flagged the PDF as malicious with a high probability. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://mezovuduw.ru/wix?keyword=hp+pavilion+dv5+manual
    • http://sfr-webmail.com/kepofixisojut6173u.pdf
    • http://nageramuvepom.mywebcommunity.org/which_processor_is_best_in_i5.pdf
    • https://cdn.sqhk.co/fexilejedit/hjc2Fhf/18653838968.pdf
    • http://jalojewaga.mypressonline.com/73204244268.pdf
    • https://cdn.sqhk.co/wekaradukuve/ghdu8gh/ladaparakazawuwodamekilom.pdf
    • http://tavafotuzefox.sportsontheweb.net/zevagisi.pdf
    • https://cdn.sqhk.co/tevosenijosu/Sjhigif/23246654960.pdf
    • http://diluzadumavotux.getenjoyment.net/roman_numeral_worksheets_year_4.pdf
    • https://cdn.sqhk.co/rapovixovuti/ejihaFr/30006693957.pdf
    • https://cdn.sqhk.co/givesaxi/gNmhc23/manual_of_chess_combinations_1b.pdf
    • http://palopepidek.mypressonline.com/13257402455.pdf
    • http://tosefabebiribow.scienceontheweb.net/jajefizoti.pdf
    • http://metalllift.ru/teologia_biblica_y_sistematica_myer_pearlman_wordk6jgv.pdf
    • http://pressit.fun/horizontal_projectile_motion_practice_problems_with_answers6etv6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_9b329c8d1488499a90d393981e52f73b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f651a9dd-7732-4340-b881-691c294cb71b/apj_abdul_kalam_books_in_tamil_download.pdf
    • https://uploads.strikinglycdn.com/files/2c1a3b7d-6419-476c-a5ce-adcbfca5acd2/rib_tips_masterbuilt_electric_smoker.pdf
    • https://uploads.strikinglycdn.com/files/909c5daf-baa7-4960-82e0-f9b4dd78e684/king_henry_died_by_drinking_chocolate_milk_worksheet.pdf
    • http://vidugozu.atwebpages.com/dolapabagiwexewu.pdf
    • http://tarepos.onlinewebshop.net/23693582547.pdf
    • https://uploads.strikinglycdn.com/files/024a677a-6bab-45d5-be4a-3cd365303f78/fodunijadetoru.pdf
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_ac48ca28b6e547d2bef75a0c2e177742.pdf?index=true
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_bb926ee3aa4847d9a8b833703b906030.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_6266a4a3e9654706bcde7cee33bf5bb9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cafdab04-98a4-4667-975c-8be5c2f9eb49/microsoft_project_gantt_chart_template.pdf
    • http://xomutojekes.myartsonline.com/california_7th_grade_math_textbook.pdf
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_15dacb964aff4495afc545ca1f4b8c4a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bc.bin
d3ab259cb0a5af7f641f6215e75e0f517a294eb0c3335d677a748ecd5c1e87be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 4660 bytes
font_01_sfnt_off00010366.bin
0c2ef4725a72b6c054042806c1db3f970b2fa4b075e508106fd40a4d72c5f885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 11240 bytes
font_02_sfnt_off0001299b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 4324 bytes

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