Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1e725810ea28d2…

MALICIOUS

PDF

69.5 KB Created: 2021-03-22 06:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41bb5388c7717afbafdb161be1f22d10 SHA-1: 7b8897ea22bbb4ae4299f26edd1597b3d241f44a SHA-256: ed1e725810ea28d2329297f2eec5b055703ef9b13556da441aa65f81fc54fa6c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary malicious URL identified is 'https://midufefew.ru/wix?keyword=g+switch+3+unblocked+games+66+google+sites', which is presented as a search result for game-related content to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=g+switch+3+unblocked+games+66+google+sites
    • http://dumubemajizukov.medianewsonline.com/2nd_grade_book_club_worksheets.pdf
    • http://nokasosozigof.mypressonline.com/how_do_i_program_my_philips_universal_remote_to_my_sony_tv.pdf
    • http://infokurs.design/fidokodemijik744ke.pdf
    • http://najetaxu.mygamesonline.org/88784830576.pdf
    • http://upsbox.ru/30863007530uiu2g.pdf
    • http://titoto.xyz/kevoxupesajamelovop2gnvo.pdf
    • http://interior.estate/what_type_of_verb_is_listenzqmbq.pdf
    • http://fitokapss.xyz/free_guzheng_sheet_musiclehi8.pdf
    • http://salestore.pro/17360420724edhot.pdf
    • http://psychologyrelax.xyz/free_css_templates_for_crime_reports8rikn.pdf
    • http://amst-watch-v2.club/23371235893pvhif.pdf
    • http://lenuvivureropi.scienceontheweb.net/garmin_vivofit_3_reset_after_battery_replacement.pdf
    • http://axacheat4.xyz/ciclo_de_krebs_rap_mp3e6r5z.pdf
    • http://tinipen.medianewsonline.com/action_research_examples_in_classroom.pdf
    • http://tikovg.xyz/26845555535wj7hs.pdf
    • http://flowerport.store/sowamonuzekutibien4zz.pdf
    • http://worldhold.online/dakorijuw6nioj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zosevid/bootstrap_3_form_validation_css.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_7f5d847d5c424b59a4e9bf89e36de050.pdf?index=true
    • https://s3.amazonaws.com/vofadoloves/mivosor.pdf
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_e038f13e2df943aab8e55abaea999769.pdf?index=true
    • https://s3.amazonaws.com/metakibeme/windows_10_cursor_disappears_on_second_monitor.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_off0000d232.bin
44fce8f9cd150eb9f4e21266f33d8d5cc8567ac9704e320e8fdaea507f4af7b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 5900 bytes
font_01_sfnt_off0000e636.bin
236a56903fdafea2c008210984b30ba8a8ed72ad5ba6859b53e5fe5d8f55c08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 10024 bytes

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