Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ec11173a77d9b9…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 01:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c5f60f2e3795689fd67fad3720200a1 SHA-1: 0c02086a321ca83a38ad3c9718dd825ca9af4ff2 SHA-256: 11ec11173a77d9b9164d57f59dede3c5220ca57826ea725cfe9ab83de6ba651b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mgocsm.in/userfiles/file/89572262746.pdf In PDF document text
    • https://meritumptt.pl/dokumenty/file/debufopebuw.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/feguf.pdfIn PDF document text
    • http://konberdbio.com/upload/files/7978812524.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/segejologajanosavoza.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914015642.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/dazipivu.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/purarosudowazilenuzuja.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bukozulanom.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145776437dfe---27371516079.pdfIn PDF document text
    • http://fourfoods.com/images/files/27034913096.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/bofenudazol.pdfIn PDF document text
    • https://coevent.ru/upload/files/narozovad.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/88043188543.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/99678648098.pdfIn PDF document text
    • http://js-space.de/userfiles/file/korutififusigire.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/7034052023.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147b3caf28be---27169429517.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/gisupovu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/lazewigidurixilarofegadi.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/71635065175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=reactor+energy+sector+tycoonPDF 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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10424 bytes
SHA-256: 2ca7c0ff1280fff95f26bf96561b109c15ce548cc9e48f9c2f09f04568bd33b6
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 19196 bytes
SHA-256: 8ae380a87f66444c078b4ca9eeb84b5af2c1ab71aac499bdd7545917d1f7b572

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