PDF malware analysis — malicious · 5df69f6b44f63433

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 18:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 30950557f8340fe4bedc1730d58989bc SHA-1: c8a36d3509ae151bef36bffdacb35ad0d8d925b8 SHA-256: 5df69f6b44f6343302ef3beda030b79833fe1753292c4559addef8c6d059e8c6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://mailing.crpm.ch/ck/ckfinder/userfiles/files/4623042451.pdf In PDF document text
- http://coolbiotech.com/upload/files/gagerukidetuvevuberum.pdfIn PDF document text
- http://cdio.vn/uploads/userfiles/file/zivuzimux.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff95eb768d---65815733545.pdfIn PDF document text
- http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/26582818086.pdfIn PDF document text
- http://marcobernini.it/userfiles/files/nogoxab.pdfIn PDF document text
- http://hoangle.vn/uploads/userfiles/file/59992990552.pdfIn PDF document text
- https://hideab.se/tc/Mediagalleri/file/46291153720.pdfIn PDF document text
- http://nessium.net/userfiles/file/gigaziwagopelabineje.pdfIn PDF document text
- https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/58154933304.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d17246293---kinuwezetagudat.pdfIn PDF document text
- https://alatheir.com/atheirwsfiles/file/94528659227.pdfIn PDF document text
- https://satellietgroep.nl/userfiles/files/nuvilelimutufud.pdfIn PDF document text
- https://www.igescanada.com/ckfinder/userfiles/files/60639852809.pdfIn PDF document text
- https://emenu.hu/editor_up/kawofuwizukegid.pdfIn PDF document text
- https://ceccargiurgiu.ro/userfiles/file/37001040800.pdfIn PDF document text
- https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/22962286855.pdfIn PDF document text
- https://iwanbim.iwan.co/userfiles/files/39392742644.pdfIn PDF document text
- https://rtaadmin.mrv-educationservices.com/content_file/files/bezetimurufozejolajoje.pdfIn PDF document text
- http://hamdannepal.com/userfiles/file/52585957400.pdfIn PDF document text
- http://ameshamagazine.com/js/upload/files/daporoxulapexuva.pdfIn PDF document text
- http://fotosvatba.net/userfiles/file/varalat.pdfIn PDF document text
- https://fsbulletsandbrass.com/userfiles/files/45407696737.pdfIn PDF document text
- https://ayurmitra.com/files/file/rosebu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=find+app+updates+on+androidPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e262.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE262	17932 bytes
SHA-256: `44e977baffc5c1a3b472d3ef6f5c5c12afef45ddb10cf8e593da510c5a515b45`
`font_01_sfnt_off000110b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110B2	10416 bytes
SHA-256: `88f10b82e1976360f186aafc6d93c71f1aa19d7839481e7601dc14e2708193d8`
`font_02_sfnt_off00012861.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12861	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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