Malicious PDF — malware analysis report

Static analysis result for SHA-256 965b9299dae438c4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 08:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aec0f8a8e406932fb2f31d0fe294b6a1 SHA-1: 475d6c9464d01d3305b6eaa976efed9aa04b45ed SHA-256: 965b9299dae438c42298bae4c89f373d62d68f3b7b044b3c8402f90bcf3efb5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm designed to redirect users to malicious content, likely disguised as a game download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters for redirection, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161424e93be18b---fekob.pdf In PDF document text
    • http://drironcat.com/images/file/nujetiporozefajamufugo.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210910171325.pdfIn PDF document text
    • http://dgjst.com/upfile/file/milaniraweje.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/70022163359.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/vonitewup.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_0FFF9790704D1C90.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18299769117.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/8379284247.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613244ced349c---puxexinexodibadorewogigo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/23049335641.pdfIn PDF document text
    • https://onecre.com/images/content/files/xudugigarijusir.pdfIn PDF document text
    • https://akvaguru.hu/user/file/migejelivagumuluwawu.pdfIn PDF document text
    • http://change4best.ru/upload/file/jemonavuromojafezep.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16312592131055286241.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/mixof.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/xepokisuxumula.pdfIn PDF document text
    • http://wych123.com/upload/files/3923313481.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/58394614649.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/burulirubewoloremesaso.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/20541084131.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/vasudedifavolozaxebi.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/19832534868.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/donubidusarilikinadusizas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=alpha+guns+2+game+downloadPDF 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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 17604 bytes
SHA-256: bf1e7376b1cf62528faa87f8f6362aec261a703cf8d7a2b25b56c5f90bc38bd0
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10836 bytes
SHA-256: f6da0003c022dab9d310830f592a44dbbaaed0c56266ebcc1de67644cf6521de

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