Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4134e14b8a92774…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 05:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6bc077eedd384244fb5b03166433929b SHA-1: c0b2d41fefe13d96df1c67ef70759513d37dfa63 SHA-256: b4134e14b8a927744ee30c74135f35ecfae198036ca567f431b2069a50fb7e5f
126 Risk Score

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-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://ponafet.ru/wix?keyword=find+the+message+math+worksheet PDF link annotation
    • http://zabavnyi-slon.ru/work_power_and_energy_worksheet_page_16bs6r.pdfIn PDF document text
    • https://vejejalerejoji.weebly.com/uploads/1/3/4/6/134600164/zifolejewosaxuwad.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/mvc_interview_questions_for_experienced_codeproject.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/relative_location_of_perth_australia.pdfIn PDF document text
    • http://molipetofokeva.22web.org/backup_service_not_available_android.pdfIn PDF document text
    • http://fly-drive.online/charlie_the_duck_2_full_version_downloady3sgl.pdfIn PDF document text
    • http://miiliioner.xyz/voice_recorder_appud50e.pdfIn PDF document text
    • http://leftoutclub.com/bryant_plus_80_trouble_codesx8lev.pdfIn PDF document text
    • http://dragonflysagewellness.com/xemomapumifisozijoyr0ah.pdfIn PDF document text
    • https://pajoxobonojizo.weebly.com/uploads/1/3/4/7/134702513/5b9334636.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/american_english_file_level_4_teacher_book.pdfIn PDF document text
    • http://italywow.space/40677445699o3dvz.pdfIn PDF document text
    • http://raisinshub.pro/confessions_of_a_mask_free_downloadyblzl.pdfIn PDF document text
    • http://jexufiw.iblogger.org/armature_reaction_of_dc_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_72d06939b8df4a46bab2c893dc94b3de.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_91c3e384d3604244adb695124341455e.pdf?index=trueIn PDF document text
    • http://soriwolawiri.epizy.com/fexum.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/arithmetic_function.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_eaab58bd70364194862dec51a44ceb4c.pdf?index=trueIn PDF document text
    • http://weparaxopulo.atwebpages.com/quimica_organica_nomenclatura_ejercicios.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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 5316 bytes
SHA-256: 814bd716fc9c296d9edd844dcbb7d7b1bad341d058878cb192cf9ceca7036e2e
font_01_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 10904 bytes
SHA-256: dff48f6592fa7754d2361b30ca3eabfa15944c9fe3cadff411df47882d780d56

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