PDF malware analysis — malicious · 0b9fe2d7b3f80847

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 08:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: e78d0cde74123a0e2674b57fd07e7fad SHA-1: e2ab5989d1bf81cb54e54ad27c185054e27f2afe SHA-256: 0b9fe2d7b3f80847a825d35a81b8178b2699d58d73284a0879c4e4b4e85e8245

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 hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=top+android+car+racing+games PDF link annotation
- http://kdwatch.net/upload/files/2021090404292386.pdfIn PDF document text
- http://heimundsicherheit.de/userfiles/file/46733933184.pdfIn PDF document text
- http://se-ty.com/uploads/userfiles/file/molagef.pdfIn PDF document text
- http://wpchkg.com/upload/image/file/xofimosimimisu.pdfIn PDF document text
- https://vietnaminsight.biz/ckfinder/userfiles/files/5853755361.pdfIn PDF document text
- https://footballsod.com/images/ck-uploads/files/13704077813.pdfIn PDF document text
- https://consurs.ro/ckfinder/userfiles/files/48488455158.pdfIn PDF document text
- https://prcomponents.com/ckfinder/userfiles/files/koronuwakosukuwe.pdfIn PDF document text
- https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/votelowomuguxawatumomutiz.pdfIn PDF document text
- http://bimbrlata.cz/UserFiles/File/51197577349.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132533b935af---77458397068.pdfIn PDF document text
- http://gmtshipping.com/attachment/file/xewuvo.pdfIn PDF document text
- http://baovekhucongnghiep.com/upload/files/felisegexajarev.pdfIn PDF document text
- http://hyswimpool.com/userfiles/kukufagapumurevumumakepi.pdfIn PDF document text
- http://salonorganica.ru/upload/files/51213920196.pdfIn PDF document text
- http://otczenacts.com/media/files/5780195443.pdfIn PDF document text
- http://kxqcgs.com/filespath/files/20210916174348.pdfIn PDF document text
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/juxigowowamomitubazum.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbd51e16f---55240407024.pdfIn PDF document text
- https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/litodo.pdfIn PDF document text
- http://agriturismocorteerbatici.it/userfiles/files/tasuralib.pdfIn PDF document text
- http://monticellotownship.org/userfiles/file/79735924711.pdfIn PDF document text
- http://111-orte.com/testarea/cwsCMSlight/media/files/wovilizopite.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/fafagapirawopiji.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_off0000d69f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD69F	10676 bytes
SHA-256: `79c191733f140cd57ebac5ba88a88d32ad359b7333b3bf06d2e16f7856ec2482`
`font_01_sfnt_off0000eed3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEED3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000106e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106E5	17012 bytes
SHA-256: `6938abf807a0d2985a3509bb7ae8a7684cf541bd324d83358f5720a6002463de`

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