Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8cbe293b2aba9e…

MALICIOUS

PDF

71.8 KB Created: 2021-03-23 02:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c02e054f0e3609c36923a1e90e73916d SHA-1: 2dd2e8e1a742b9ff3cf5c917b79c57e7d11c7a15 SHA-256: ca8cbe293b2aba9e1229522cf4fad5c330a6b978f19c3b633dec67e69b44a17f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=acordes+de+guitarra+canciones+infantiles+pdf PDF link annotation
    • https://cdn.sqhk.co/pekobenew/ginibIV/juwilejunenino.pdfIn PDF document text
    • http://presalle.xyz/tufedegikipuvezuxav817t2.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/0hjhygd/tiny_piglets_whole_world_changes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_60446c79527f7.pdfIn PDF document text
    • https://vanoxurele.weebly.com/uploads/1/3/1/6/131606202/wumulokujerawefeni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5ffb1cf1c02be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_6052407cbae83.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/Gkhfehc/at_t_smart_wifi_extender_troubleshooting.pdfIn PDF document text
    • http://vladmer.ru/the_shack_movie_trailersi4i6.pdfIn PDF document text
    • https://wizawexixif.weebly.com/uploads/1/3/4/4/134472694/d04c5e5b43bcab.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/ZG8hjwi/56032306499.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/135725466695cdl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_603435cd6e807.pdfIn PDF document text
    • http://yblda.fun/real_estate_showing_agent_jobs_near_mertr0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_600c1d0caf4c5.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/eQThegf/free_music_download_apps_for_iphone_listen_offline.pdfIn PDF document text
    • http://euromarket.pro/braun_series_9_cleaning_station_cartridge30a11.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/03f7fbf1-d1d3-4ceb-a03a-91e00c8a14dd/vuwivubapajujosizegofal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f163525a-f41d-46fa-b905-533fec0be973/quadratic_equation_word_problems_with_solution_and_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ed6df4-bf0f-44f8-b1aa-4d80e57fd627/36528041655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab6ca5c-d435-4d8e-b5a5-525efb27863b/why_isnt_my_pressure_washer_building_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4210fce-18e4-4fef-9f85-e009fe8e991e/10742226680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52bb517-ab34-4c50-b188-e6c00f2c7df6/lujogakakadolir.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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 5312 bytes
SHA-256: 2119c23838fdd4e5b81cc534fbf053b1b9f2926ca9d1781a3b734ca4c25e2063
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 11720 bytes
SHA-256: ca5db639f5912e8c849de2e27dc3d02858d300eb242382e9d98ba102d78f5c77