PDF malware analysis — malicious · f385594f65deccb0

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 08:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: cf5c580b40aeb3dfbefc12e8a8bf6b9d SHA-1: adc40e74e0ebc8cebf8f4279f45ac8824d69868d SHA-256: f385594f65deccb036b3993af306f011f7050891d129b7fde7f9668b4d7bf8ad

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as a Flash Player update. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=flash+app+download+for+android PDF link annotation
- http://trunghungplastic.com/luutru/files/275574539.pdfIn PDF document text
- http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/95404648829.pdfIn PDF document text
- http://csc021.com/userfiles/file/20210907170254_3wdj20.pdfIn PDF document text
- https://silverlabpupsforsale.com/userfiles/files/zabazufokeb.pdfIn PDF document text
- http://geodeslaboratori.eu/userfiles/files/14614314601.pdfIn PDF document text
- http://newworldss.com/uploads/file/35784651962.pdfIn PDF document text
- http://malovanesklomh.cz/images/file/82739063601.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/jumorezifejebome.pdfIn PDF document text
- http://cattaneoarchitetti.it/userfiles/files/64869345183.pdfIn PDF document text
- http://lovesenergy.com/file/rezopogije.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/57311435197.pdfIn PDF document text
- https://maconlux.ovh/userfiles/files/rifativimusiwilanekuw.pdfIn PDF document text
- http://tuvanluatdanang.com/upload/ck/files/lasejivovoxonemokuz.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f68rbpp98bhqe0bmuop7jdd6cq/vatex.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133184018f1c---vudukavonorolumumubudoni.pdfIn PDF document text
- http://ky-auto.com/uploadfile/files/53522382297.pdfIn PDF document text
- http://carscaso.com/js/upload/files/67806226070.pdfIn PDF document text
- http://jcnjl.com/userfiles/files/wixuluvisatatunixigalitul.pdfIn PDF document text
- http://studiomalpocher.it/userfiles/files/tivoruloguvefo.pdfIn PDF document text
- https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wevigumuvoludaf.pdfIn PDF document text
- https://bcm.es/files/galeria/files/soxuk.pdfIn PDF document text
- http://affectif.ro/data/Image/file/51810570503.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/79639150153.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161309100ce2c5---92736641716.pdfIn PDF document text
- https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/pozobowa.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_off0000bb42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB42	16516 bytes
SHA-256: `0dd64159c1b2735209b76886774a5ff8be2ace2c4afb525f48be1f655ddbcef6`
`font_01_sfnt_off0000e55c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE55C	10428 bytes
SHA-256: `46582489ac845c74f9cfdc150f60226c7f3d45b49bb3a053ef6f291576a59787`
`font_02_sfnt_off0000fce0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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