Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07ea471790ae88a…

MALICIOUS

PDF

71.1 KB Created: 2021-03-29 20:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 075f80cc8bf87f3ad3de64ae0e7adf74 SHA-1: d66b1386d5bd151fc3fa20c9e89ade50c950f012 SHA-256: b07ea471790ae88a7a6db54f1fa7771b26706f841a40a2bbcfd93c87e71321a3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dafemum.ru/award?keyword=el+inmortal+borges+pdf+descargar In PDF document text
    • http://dabinepoj.mygamesonline.org/opencv_c_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/whdjfjj/rewipopejuxep.pdfIn PDF document text
    • http://gugozefo.22web.org/byzantine_literature.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/49565763020.pdfIn PDF document text
    • http://vofufime.mypressonline.com/statistical_process_control_demystified.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/7b99Gia/tofokuvenewowugibinilepuf.pdfIn PDF document text
    • http://zebafafopurew.iblogger.org/focus_on_grammar_1_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/ighdEgi/tuner_gstring_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/h4ijgyc/6059817885.pdfIn PDF document text
    • http://rakuwotakiko.22web.org/94859355384.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/haqWjfi/hourly_weather_for_freeport_il.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/tepulezad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9ede5d-1b95-4e87-b801-8a2d3df29366/50370783092.pdfIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_7b3652a8c10a4720ae1de632b482346f.pdf?index=trueIn PDF document text
    • http://xavimew.rf.gd/bender_gestalt_testi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8617b9-9c4d-4513-9bc4-858d6ab945cb/54618785658.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_ab212a8a243944a399b0f06a96d31d87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b3f24f-db91-401b-be5f-8919d521a4fe/how_to_use_pmd_clean_pro_silver.pdfIn PDF document text
    • http://zegemipufe.epizy.com/75431868587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f9a544-62bf-45ea-af8f-40b73c657707/what_is_business_management_consulting_services.pdfIn PDF document text
    • http://totaraxidob.rf.gd/35326328987.pdfIn PDF document text
    • http://widabuve.epizy.com/bogokaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b313709-2035-4c49-85f3-a34629de7639/86275194991.pdfIn PDF document text
    • http://jikibepedoroto.epizy.com/50476838083.pdfIn PDF document text
    • http://gusizozubamu.epizy.com/free_laravel_admin_template.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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 5572 bytes
SHA-256: 0d730d5dc7f19a3816499ce8731143f9ba21d8c555dc3394b11552be642fa242
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 11536 bytes
SHA-256: 85db99ac1ad08b1eda82586475337afd5053eed156595a063a32ec525400cb3a