Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1974254f13f6dc…

MALICIOUS

PDF

84.7 KB Created: 2021-04-02 00:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 777fae30e388c0f5786df38c7e158eb5 SHA-1: 4ee6a075d430674b801bcefd72fd20f99b439cc6 SHA-256: 8b1974254f13f6dcbb5a85792e8af2d642d1884fe17ee4e7d3eaaf310d7f2349
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=scientific+riddles+with+answers PDF link annotation
    • http://juvovagesubo.mywebcommunity.org/thus_spoke_zarathustra_music_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/5jfjcge/sewal.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/cNXiNhi/ninja_assassin_games_revenge_knife_killer_game_download.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/jugujudo.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/gexefekezajobuderabozaxi.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/billy_graham_biography.pdfIn PDF document text
    • http://xifogoweru.22web.org/46848928283.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/jDB4fT5/idle_breakout_import_code_cool_math_games.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/the_power_of_focus_jack_canfield_review.pdfIn PDF document text
    • http://negifowutagur.mygamesonline.org/business_case_template.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/39667225397.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ggmwig6/pc_simulator_games_highly_compressed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betitunusepa.epizy.com/syma_x5c-1_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/how_to_hook_up_a_rca_soundbar_to_a_tv.pdfIn PDF document text
    • http://limirosu.rf.gd/retomuvowobeligifumo.pdfIn PDF document text
    • http://webifojut.epizy.com/90310276347.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/wuwikugutun.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/kizinirejijujititenidob.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/xilinx_ultrascale_clb_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/nvq_level_3_electrical_installation_answers.pdfIn PDF document text
    • http://tepominofujemo.atwebpages.com/arteri_perifer.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/75447083986.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 5304 bytes
SHA-256: f9570c1c5b5e58941f56a17afeeda3769904a255c992dbf60c1f88fda8b20fc9
font_01_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 11212 bytes
SHA-256: 1698ba6b0bcec1f9c526cc81c4f8bf3a588cd57bcb1bad3103c34f0cc7fdb825

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