Malicious PDF — malware analysis report

Static analysis result for SHA-256 4190ed099c049464…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 03:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83ced6e46a8e109df02eb66885eb335c SHA-1: 4eb03bbd3b8e5bb327e3c44bf68bd781e766481a SHA-256: 4190ed099c049464b1ffe39a00012c7ffafc85f7adf2f11931e939534652d1e2
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to a URL, as suggested by the PDF_URI and EMBEDDED_URL heuristics, to deliver a phishing page or download a secondary payload. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://www.likoda.com.tw/upload/ckimg/files/fewizavudovuzovipexi.pdf In PDF document text
    • http://objets.immoweiss.lu/userfiles/files/70468495463.pdfIn PDF document text
    • https://finliz.lt/i/File/firexute.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/97052396992.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/37013411178.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/73254695345.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/88528426883.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/48732891185.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/83953742931.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/26343639911.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/9574570092.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/legokigoti.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2cac0c05---bexobugoposixogovamuwapu.pdfIn PDF document text
    • https://posh.hr/files/44607510970.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/govanabuwuduluz.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/sirusudusibebevawipi.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/34648269283.pdfIn PDF document text
    • http://iknow.pl/files/file/66874572406.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/67156006459.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6fd3d79ee2880931211b6c369798667b/30391004726.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210916_6B1E47762EE61781.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/vukum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=contest+a+parking+ticket+onlinePDF 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 18416 bytes
SHA-256: 0378d21b21434365a69da484a0fe7694cd228bd4945b4e74d6bdcd33ea36f5b4
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 10672 bytes
SHA-256: 08698e9055fedb9902b63162366ab2098c6eb883351e99d27d47aeb5905f10cc

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