Malicious PDF — malware analysis report

Static analysis result for SHA-256 8740b4ca20a5a135…

MALICIOUS

PDF

76.2 KB Created: 2021-02-20 15:37:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 20aba39f44e457cb7b4b1f10355dc680 SHA-1: 01c16f22fa06bf1dd973716bb18e51baab67f230 SHA-256: 8740b4ca20a5a1357dcb909bba6271b2e89bd0d0ecd85d88d096551e11a55689
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/wix?keyword=zamberlan+960+guide+gtx+rr PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446395/normal_6015bfd12ad7c.pdfIn PDF document text
    • http://small-italy.space/beethoven_virus_guitar_tab20fpd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5fdc2cdf15e7d.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/jepsjjS/xuvijelomagizezutex.pdfIn PDF document text
    • http://localdesign.me/kasalowebomaperimodozadysqsv.pdfIn PDF document text
    • http://albatros-trans.ru/samsung_s8_not_fast_chargingmw7k9.pdfIn PDF document text
    • http://zunukaxisorulev.iblogger.org/88199144853.pdfIn PDF document text
    • http://lianhua.life/leadership_worksheets_for_highschool_studentseyruw.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/jcEiapj/schools_rugby_league_2019_fixtures.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hChajgs/97436055022.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/HuTdRid/pac-_man_championship_edition_nes_demake.pdfIn PDF document text
    • http://fitit.space/crosman_1077_silencer_adapter9avnl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxijejazaxedaj.epizy.com/cyclone_fani_project_report.pdfIn PDF document text
    • http://sugizujesel.epizy.com/mentor_calibre_manual.pdfIn PDF document text
    • http://kivevufawonin.rf.gd/subletting_rental_agreement_template.pdfIn PDF document text
    • http://gugujis.epizy.com/leave_application_format_for_class_teacher.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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 5584 bytes
SHA-256: 440632558011fce32b7b91f01be31cc496ec41fc5d173651aa284192d868aa8e
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 14232 bytes
SHA-256: 22a977fb8e7f0e6a1786ba5094d7f64f59203ba9954a84b600316098823748da

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