Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d0f3d2a186cb56…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 11:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7f4f2285f838c8889d0c85621c2503bd SHA-1: 782b00bf9bdf68676c75a2d4d2f1953da12d2176 SHA-256: a9d0f3d2a186cb56b5292f5e34a805648c7435aadd4737742578274bf82763a7
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many pointing to disposable domains, suggesting a phishing or link-farming scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/strik?utm_term=shadowed+souls+limited+edition PDF link annotation
    • http://dragonflysagewellness.com/fun_listening_skills_activities_for_adults34os8.pdfIn PDF document text
    • http://masterpowerpoint.com/lesiketunajitesexhyrm0.pdfIn PDF document text
    • http://consequences.space/74218197353vwgws.pdfIn PDF document text
    • http://de-bewertung-889562.icu/el_caballo_de_troya_libro_completo1tppy.pdfIn PDF document text
    • http://netewe9.xyz/48737510754yxy10.pdfIn PDF document text
    • http://reestr.site/77108546781ewftf.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/iu7hcjh/the_walking_dead_video_game_2019_review.pdfIn PDF document text
    • http://lidosovebug.iblogger.org/supermarket_billing_system_project_report_in_c.pdfIn PDF document text
    • http://yarrebitteh.online/juxigiweretobitcwxd.pdfIn PDF document text
    • http://kieverts.xyz/change_background_color_of_text_javascript0co02.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/lazasuwemanikumical50.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/aiegfkX/snake_vs_block_hack_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosakev.epizy.com/tonutokorejavagebasovexi.pdfIn PDF document text
    • http://mirokukuvo.rf.gd/kurukusa.pdfIn PDF document text
    • http://pakuzubexur.rf.gd/wejaxepakupikosomirozeru.pdfIn PDF document text
    • http://naxokagad.epizy.com/zowulozuzisofe.pdfIn PDF document text
    • http://wawopuviginase.epizy.com/togamikowisuri.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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5164 bytes
SHA-256: 67b6c0e915f5e354c1d3c02d1ecbaab65598ddf6b4fe8d4def5b467c446ffd6d
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10772 bytes
SHA-256: 686d4dd4c90eb5eb095b1930dbe9ff141428a9ca302ccb40f9c0b562966ee9fb

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