Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9e44002e835a26…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 15:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 463962634d19fe211333fd78c4eead64 SHA-1: 88b5c85568d1ef9b3e5dd25e032970474c71d5c0 SHA-256: bf9e44002e835a2609601191ccf8548402d32df8ffff2408f585f6ba2e8c610f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/123?utm_term=joker+hollywood+movie+tamil+dubbed++2019 PDF link annotation
    • http://iminn.ru/27142851272dobin.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/jid6ic6/blocky_jumping_run_avoid_shark_tank.pdfIn PDF document text
    • http://eeeeeyyy.space/31646822855szt4h.pdfIn PDF document text
    • http://yazansoft.com/what_is_authentic_happiness_theorygswjn.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/he36xhf/flying_birds_gif_animation.pdfIn PDF document text
    • http://itdomen.fun/timex_wr100m_watch_battery_replacementvps58.pdfIn PDF document text
    • http://trellos.fun/darodijefz9xkl.pdfIn PDF document text
    • http://bridgecommerce.com/lista_de_paises_desarrollados_y_subdesarrolladosoy43q.pdfIn PDF document text
    • http://hookup671.site/99036833454yua2b.pdfIn PDF document text
    • http://espacecmb.xyz/80049517465zhr49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/manual_axiom_pro_61_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdb0fda-e970-44b0-9d8f-f34756022242/25396558015.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/juvumeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd15ae3-5556-4789-a552-745e1ac7fc4a/how_to_write_a_good_compare_and_contrast_essay_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/personal_assets_and_liabilities_statement_form_sbi.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/new_bangla_album_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/all_name_reaction_in_organic_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e87af38-203a-407c-b7eb-21b66942874b/zebra_zt410_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/broken_vow_piano_sheet.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_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 5816 bytes
SHA-256: 1460cdbf7f3df94cc3d59ac7b6befd69a7f22c9002394450988b64b211c07364
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 10608 bytes
SHA-256: 2221e057737181d69b7100f4928c7e4e3a047973ca93b07f59d9e00fa0ac7270

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