PDF malware analysis — malicious · b599fceab4195b41

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 15:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: e7211e5eb20733f22d1bff4e2a18dfe4 SHA-1: 8aedb8d92fd95dd1f3e6d3bde0110cbf3cb72817 SHA-256: b599fceab4195b41d7c56a775247c607017e50461a3e15f0167bd9dc72b6c9c3

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to other sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support its malicious nature. The sample likely attempts to exploit users by presenting a download lure, potentially leading to further malware infection or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 6

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://cructi.ru/uplcv?utm_term=download+pes+21+ppsspp PDF link annotation
- http://spharma.ua/files/file/87330187658.pdfIn PDF document text
- http://yucehukuk.com/resimler/files/50033485492.pdfIn PDF document text
- https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/3703567835.pdfIn PDF document text
- http://studiomanzetti.it/userfiles/files/9676994002.pdfIn PDF document text
- https://vanphongphamhienluong.com/upload/files/xikisavoreb.pdfIn PDF document text
- https://www.hkha.com.hk/ckfinder/userfiles/files/22525906199.pdfIn PDF document text
- https://kermanrooz.com/img/files/bujopezafobanizofigero.pdfIn PDF document text
- http://cerritos.songhakbbq.com/uploads/files/butaxugagakefuxuweluzurom.pdfIn PDF document text
- http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/43768291733.pdfIn PDF document text
- http://vtaky.sk/media/file/7815709701.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa80679f5---kodarek.pdfIn PDF document text
- http://www.singchai.co.th/ckfinder/userfiles/files/numuxamoribemolaxejonebun.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399203bf7ee---56706502867.pdfIn PDF document text
- https://gkatsov.com/userfiles/file/dekubasefakadif.pdfIn PDF document text
- https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/23974798093.pdfIn PDF document text
- https://hkparkkonutlari.com/image/files/20445482140.pdfIn PDF document text
- https://servauto.fr/img/user/file/fokef.pdfIn PDF document text
- https://www.nstoplana.rs/ckfinder/userfiles/files/39543310580.pdfIn PDF document text
- http://4darchitecture.org/img/all/93002554220.pdfIn PDF document text
- http://ladispensadicampagna.it/uploads/assets/file/52714427906.pdfIn PDF document text
- http://letsfinal.com/userfiles/file/pilabiguxovakavubufabagif.pdfIn PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/83550287298.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d754.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD754	19216 bytes
SHA-256: `b28463feec3cf71274d6011f6978496e8943e5bab1c6b8f071ffd91e04d91a3a`
`font_01_sfnt_off000109ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109CA	10356 bytes
SHA-256: `c694026a3f4b7d48edd1aacdaded157e05b32a2a5053b374fd9ba3a4b3643565`
`font_02_sfnt_off00012176.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12176	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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