Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd517f93e0e6d57…

MALICIOUS

PDF

78.4 KB Created: 2021-04-17 10:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b3be4a237f195e6339f2f27955f75c1c SHA-1: 25df4d6dfd83d91240751b6ae8c586432576a920 SHA-256: efd517f93e0e6d57297a268c9db08b503fab2f579f1e669f6823892b59f650c3
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 0.9997

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://resalured.ru/strik?utm_term=is+it+good+to+use+a+diffuser+on+curly+hair PDF link annotation
    • http://proflist-briansk.ru/descargar_geometry_dash_world_para_pc_sin_emulador0auvu.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://avtovishki-msk.ru/fm_whatsapp_6._90_apk_uptodownudb78.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/hdwEjhq/fall_guys_ultimate_knockout_best_price.pdfIn PDF document text
    • http://turistik-a.ru/93366663653qssli.pdfIn PDF document text
    • https://cdn.sqhk.co/diwelamu/hgegjja/wizarding_world_of_harry_potter_hollywood_rides.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2ba8bd8947.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/LlnPgcz/52845626984.pdfIn PDF document text
    • http://segway-wheelchair.ru/letter_d_worksheets_free_printablesxwchs.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/bKHakjb/dagusutedoredanutuwosop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_60122d525f492.pdfIn PDF document text
    • http://cheapestshop.xyz/luxefidulixsp32.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/55537745928a2o3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_603eaf54aca0f.pdfIn PDF document text
    • http://logoped-samara.ru/simulacra_and_simulation_full_download1fa03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_d544f94f8f4e42dbb6dffbc84bde00c1.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_88331dac061d47b0baa4967641f37e8d.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_65dd73ec5c994b1abe2f5bd59338ed02.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_5df7b84898b84c8b92664dd75b725e6d.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_528438ae1818440295d2b0fc719536f1.pdf?index=trueIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_36aab113319e4e0e9cd8b98d0488ff12.pdf?index=trueIn 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_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 5324 bytes
SHA-256: fad2b9088b8ea5f89e348ddfa5efb1ec868d48c92f10ebece8d9321fdd4e3078
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 11124 bytes
SHA-256: b35e4b9e1a7c2344b93ae578764a1e482d3ea07e80e9c57c9e983b3df7784d1f

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