Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bae4aa9a60e0c34…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 23:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1b7e8ff42230396971850a89db3e2102 SHA-1: 1c559c0d522b1649c02b7f5c894ea5c3e879b1f6 SHA-256: 5bae4aa9a60e0c34667d3447236c4f22a7fdb689ca86249fdf3fdf3cd79666a1
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, with one pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/award?keyword=affretement+maritime+pdf PDF link annotation
    • http://temilops.xyz/57470699470g7goq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_600fccbe16921.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/synonyms_worksheets_for_grade_2.pdfIn PDF document text
    • http://naturka.space/surah_yusuf_download_freefgzz6.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/zitipara.pdfIn PDF document text
    • http://giocodigital.space/database_management_system_mcqs_for_ppscv3boj.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/danarisim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6011fb3918335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_6059e4a424049.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/rixopobosave.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/5106a8ab89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_6045854fdbb98.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/25822119850.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/pipaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6048186ebf5e2.pdfIn PDF document text
    • http://trend-sales.fun/automatic_car_parking_system_ppttsszl.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/kefiperizonofu/meginavoxijoba.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/homebrew_race_template_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/written_business_plan_in_ethiopia.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_f10b832194d045d6b9ce7048108c0f5d.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_e003143ed69d461489de89f59d0c79ce.pdf?index=trueIn PDF document text
    • http://domuromu.atwebpages.com/josatozezeb.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/bedumukaborururofa.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_bfa5d9edbccb4fb3943ede73da5227c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/11648190892.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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 4968 bytes
SHA-256: bafeac123bc02e78074a736481476ad08957ebba42c178b9c5ae7c7b49cd657b
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 12016 bytes
SHA-256: 88637ec914b5cae7fc93586380fff32b9169766d877930a763be4dd43e3f9708

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