Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0934d6d84d70e28…

MALICIOUS

PDF

83.8 KB Created: 2021-03-02 10:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2419f7cdd6b9190864be712e4dcfeac SHA-1: f46704e467bbd1ca39feda354284a81a14dbb2cb SHA-256: a0934d6d84d70e28cbcc90a7a02adc809e944b194f57e215173f181b32bc96a0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

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://vilenefex.ru/123?utm_term=how+does+gravity+affect+time
    • http://pomirkapa.site/do_you_get_a_home_inspection_on_new_constructions6nf5.pdf
    • http://jalopava.22web.org/jenkins_interview_questions_and_answers.pdf
    • http://lodomujimujug.mywebcommunity.org/84537921561.pdf
    • http://taxokijoba.sportsontheweb.net/99277332848.pdf
    • https://cdn.sqhk.co/jeforije/XrKgcVZ/business_planner_2020_template.pdf
    • http://tisibodonal.22web.org/vekubalitadip.pdf
    • http://tidirakozodawon.getenjoyment.net/defiant_daylight_adjusting_indoor_digital_timer_instructions.pdf
    • http://naturfresh.fun/sagakopansqkn4.pdf
    • http://idclick.cash/everyones_an_author_with_readings_freeuc99u.pdf
    • https://cdn-cms.f-static.net/uploads/4449172/normal_601be41e6c33b.pdf
    • https://cdn.sqhk.co/pixafosabow/hfihegg/23330702483.pdf
    • http://vibolofisef.mywebcommunity.org/anatomy_and_physiology_coloring_workbook_answers_chapter_7_the_nervous_system.pdf
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5ff8a97fe7c86.pdf
    • http://tvoeobrazovanie.fun/pitman_shorthand_new_erax7yam.pdf
    • https://static.s123-cdn-static.com/uploads/4370987/normal_5ff0d0ef5928f.pdf
    • http://geosen.net/rolezagixasazoyj1bj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuwawibu/gatodosavesavanixijeb.pdf
    • http://damatagowigiz.epizy.com/cambria_font_for_pages.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001038a.bin
d4d8589df3be270094704b69d9a678a476502f34f8b0db738ed759c0f9ab2f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 5524 bytes
font_01_sfnt_off00011660.bin
d10921fb0bbf98fcedba60f98658742c94fba698ce6ca74f484df67c098634ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 13392 bytes

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