Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a41d28cec9d3c07…

MALICIOUS

PDF

66.7 KB Created: 2021-06-01 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b6ded4888fd86f584b1943348c93119f SHA-1: 555e9f89ace183f00afe4fa212b469841e1a5f27 SHA-256: 4a41d28cec9d3c07e3e0747ccbb8ac9e40ca25eb92d55a8bd598f1f9d493dc84
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 0.9992

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://botokaw.ru/123?utm_term=tilbury+pioneer+academy+ofsted+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60319cf4d6cb8.pdfIn PDF document text
    • https://juxewuvolexi.weebly.com/uploads/1/3/4/1/134109000/5322726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487905/normal_5fce3c00f0950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_600a101a67840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_603308f4960fe.pdfIn PDF document text
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/sewosinisagigedaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fe07bf39fdeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5ff94c9c478a0.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/lurofafiw_ruketu_supezamugifoxim_pexakotapepulop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fee73c30597e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikabipi.pbworks.com/f/how_to_draw_a_mountain_landscape_for_beginners.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/f1_manager_tips_for_qualifying.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144444585/grand_summoners_guide.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/sowakojovikazubamam.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144412821/stative_and_dynamic_verbs_exercises_multiple_choice.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/96352728075.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144428004/brt_iletme_sermayesi_nasl_hesaplanr.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144423960/biodata_form_editable.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144441549/how_to_read_a_stock_ledger.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/sda_bible_commentary_vol_4.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/o_que_genero_fluido.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144439164/matagumimibalorapedikatu.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/kigudapobaluzijojisep.pdfIn PDF document text
    • http://barumena.pbworks.com/f/monsieur_ibrahim_et_les_fleurs_du_coran_film_complet_vf.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_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 5492 bytes
SHA-256: 286d85095c72f817270b1b7342d5fb22ee65bb9cd38656d359e060314d608298
font_01_sfnt_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 10424 bytes
SHA-256: 410694bd1db8c89bdcffe1d4f5556eb5182e03122b001e41438370c82f26e99e

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