PDF malware analysis — malicious · a4e5ae0d7bd15149

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 02:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 684f955e5d1a73317640eed868f895b2 SHA-1: 411928cfb0cad174548d1c1a2b18d64de481ea9e SHA-256: a4e5ae0d7bd15149b67692d8b6070e597f081ff48719dbfd435a58bf65f9c6d5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using numerous unique, low-reputation links to obscure the true malicious destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=viu+app+apk PDF link annotation
- http://kapsalonindex.nl/images/uploads/wozekelez.pdfIn PDF document text
- http://eatatrudy.com/uploads/files/pifadafelasigobujexixu.pdfIn PDF document text
- http://skulpt.in/admin/uploads/file/gagejakukonisiguwa.pdfIn PDF document text
- http://mellorymotors.ru/admin/ckfinder/userfiles/files/tifagupugudodawo.pdfIn PDF document text
- https://resulgame.com/calisma2/files/uploads/34432822154.pdfIn PDF document text
- https://cursosadistanciayonline.com/medios/files/bobedin.pdfIn PDF document text
- http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161369aed0e01d---39034055791.pdfIn PDF document text
- http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/46433099617.pdfIn PDF document text
- http://knipia.com/userfiles/file/8351294137.pdfIn PDF document text
- http://xn--franzsischebulldoggen-lec.eu/userfiles/file/55432655102.pdfIn PDF document text
- http://hiroshima-teishaku.com/userfiles/file/92289573121.pdfIn PDF document text
- https://medtek.vn/storage/file/jewidil.pdfIn PDF document text
- https://protradingindia.net/userfiles/file/nuduxobuka.pdfIn PDF document text
- http://salespate.com/userfiles/file/8009867803.pdfIn PDF document text
- https://clubelsendero.com/img_pag/file/19117633587.pdfIn PDF document text
- http://www.farmaciapenil.es/userfiles/files/gafozikamuraxosodatavodi.pdfIn PDF document text
- https://termofriz.rs/files/37908888050.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe64f2abd---68154181365.pdfIn PDF document text
- http://bbhshipyard.com/userfiles/file/25892133284.pdfIn PDF document text
- https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
- https://hanedantoptan.com/upload/files/sidoropopanibesoje.pdfIn PDF document text
- http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/24380784044.pdfIn PDF document text
- http://kondicionery-lubertsy.ru/upload_picture/file/3808252247.pdfIn PDF document text
- https://easyown.ddproperty.com/datas/files/22956838163.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_off0000da52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f268.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF268	9640 bytes
SHA-256: `57071a42ca85731773ffff29c2b000cc38c04177f4e08e60ca54dc29a74d7894`
`font_02_sfnt_off0001075f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1075F	18692 bytes
SHA-256: `f2faaecef9b7d8720042938ec68821ad6a4aacca8f9f0ca02a3a7d61f08f7f41`

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