Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3867898b758f0a…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 11:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e987a18ac700a2fb2cd8a94faf1aac6 SHA-1: 34dff4af6e392370b0afa6447c54e36bb95e5575 SHA-256: 4e3867898b758f0aed0f3fe2564dee592f74cb4799d2da4b25a33686616bf533
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination or distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://movingalpsfoundation.ch/userfiles/file/ginipakubamutatetawu.pdf In PDF document text
    • https://pmapmc.com/userfiles/image/files/94257513816.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/ditokofuj.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/lotaguxebegijabixizo.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///56907524508.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/luxuxolexekawigegowixul.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea61312c18---22779978930.pdfIn PDF document text
    • https://digireg.se/upload/44921029226.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/wadewer.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mafitudewagakabil.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/bejenelepef.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/febofub.pdfIn PDF document text
    • http://meskerjager.nl/media/files/12547483563.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/perisaxazit.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/37256970242.pdfIn PDF document text
    • https://media-get.com/userfiles/files/86769166218.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109071521286100.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/59421906697.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/37727298484.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/3687107241.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/buzubikinebikuvuxu.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/83901342651.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gojevumap.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///16042371317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+set+ringtone+in+redmi+9PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 18516 bytes
SHA-256: c495d72d7c3d859aaec1bf32815c9a6d3992b8a40e82bc8681d584cfdfa84461
font_01_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 10628 bytes
SHA-256: 4bfb6555e3dff9bd5736bc53d0f5cd527714b7fb0b6c719a851e6dc8976a21c4

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