Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e178bc730ce13a…

MALICIOUS

PDF

82.4 KB Created: 2021-03-14 05:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 53586b2a364c57d3768e513b0c39fdbe SHA-1: dff5e781fc8388542f40648763f7b22d5f800452 SHA-256: 41e178bc730ce13a4c31f57450ebd18e792cf2e58d2107f98a010eb43e8111de
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF's structure and embedded links are designed to redirect users to harmful sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=beginner+bible+study+plan+pdf In PDF document text
    • http://xelasurugopu.mywebcommunity.org/80873906974.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/iijjhdH/furususomavobepanidujawo.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jaDyUSq/windows_server_remote_desktop_session_limit.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/pandoc_html_to_page_break.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/TzkGLjj/chowka_kannada_movie_full.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_does_yeast_infection_affect_a_woman.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/abs_cbn_tv_plus_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/ANhia7C/lodomibavu.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/b4IRPjg/76501425322.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/cbjhPyf/dibugamulevog.pdfIn PDF document text
    • http://manovina.mypressonline.com/ninapunimiturugifalusogob.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/9M1VHhc/lightroom_presets_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/hajiibM/warzone_download_blizzard.pdfIn PDF document text
    • https://cdn.sqhk.co/jorimalid/6UEghjh/corrective_action_report_template_manufacturing.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/fwMAbif/undatakah_paladin_rise_of_shadows.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/U4GJgce/45800035283.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/iiGidg5/lowenog.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/WXJaL8k/94931423809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xakusineba/vakorilil.pdfIn PDF document text
    • http://givetupazowo.onlinewebshop.net/guximunefamazufufobekiri.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/cartoon_network_tv_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/debubil.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/23524270617.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/41563802067.pdfIn PDF document text
    • http://bupalim.atwebpages.com/may_2017_sat_qas_answers.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/23763564039.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_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 5272 bytes
SHA-256: 3dcf97576df627e6697aaf120491b26c1213d050a2c829e9284f2736381c4589
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 10388 bytes
SHA-256: d4daeef90ba3e027b8a26200748f24c5ff596ec745e03428db7d67970bfcad36
font_02_sfnt_off00012c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378