Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3725729fd8bbf60…

MALICIOUS

PDF

68.4 KB Created: 2021-10-02 17:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dbbcc4b30856d9fcbf0540f8b7732bea SHA-1: ab913bb789d1a1a5fad1ea72e2fecdd97e3c31bf SHA-256: d3725729fd8bbf605f8076baa9f289406b31f16193735f0d28ca724c5a514a83
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://smidgel.ru/uplcv?utm_term=how+to+tweeze+eyebrows+male PDF link annotation
    • http://micruts.org/userfiles/file/6844934406.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/68910045839.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/12505346650.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/nizotidikizusuwonazu.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/bakutul.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/45891860720.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/xapilazerewanimed.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/fitawibexizuve.pdfIn PDF document text
    • http://em-ail.ch/pictures/2/83169762506.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///zafuwaximu.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/luramejevoxekazoruxit.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/bijerupapoligowu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wekukumofetojobuxewu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73510384579.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330cbe8f25c---pinadivanebunaj.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/runuvoxuwiluk.pdfIn PDF document text
    • https://hojoairport.com/images/file/30241884358.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16142f20a5e3c2---ramobumijib.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/23563588187.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/zafifiletarewu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24471005239.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/mexaviwivowosopazo.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://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_off0000ae0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0F 10464 bytes
SHA-256: e742abe95dd9c806084ae2acfc539486f6ccc5a4d4c05a6664fbcae0a2253b45
font_01_sfnt_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 15236 bytes
SHA-256: 44a91add5f28bc70527499acf1c98a1c4598fa5121a75ddc50d0218aec9e5869
font_02_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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