PDF malware analysis — malicious · 1b4204726061797b

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 03:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f7081f5bf8d35b7ea139b853b86d1499 SHA-1: 0070586a006130c9bc76dd7a3270def4b75fe7ca SHA-256: 1b4204726061797b2c5149095e41d738ee0dbd72e0eb7e88caaa0f6b282b73ca

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to malicious sites, and the numerous URLs suggest a link farm or phishing campaign designed to distribute malware or harvest credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://medvor.ru/uplcv?utm_term=4+morant+roblox+id PDF link annotation
- http://agriturismocorteerbatici.it/userfiles/files/39870040893.pdfIn PDF document text
- http://ctmmaximoravenna.com/ckfinder/userfiles/files/milagubomutadiri.pdfIn PDF document text
- https://oceanflowerhotel.com/uploads/image/files/87942486079.pdfIn PDF document text
- https://vargyasnekonyveles.hu/kepek/other/file/bemifomuwazutudabud.pdfIn PDF document text
- https://fibra-optica.ro/ckfinder/userfiles/files/fufibekosiwuzoxegegegatu.pdfIn PDF document text
- https://infosantiere.ro/userfiles/file/wagafoponikolozebedu.pdfIn PDF document text
- http://mylivediamondinventory.com/uploads/files/88936545871.pdfIn PDF document text
- http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tibuwenesevazuzanedobanum.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/61738388191.pdfIn PDF document text
- http://gold-carsales.com/js/upload/files/pagefatazuvukunijut.pdfIn PDF document text
- http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rozatixaginapalij.pdfIn PDF document text
- http://vouchertiket.com/airplane/ckeditor/uploads/files/55747359485.pdfIn PDF document text
- https://assignmentmart.com/ckfinder/userfiles/files/gosulapepita.pdfIn PDF document text
- http://medi-sen.com/files/files/35164232449.pdfIn PDF document text
- http://komodovo.ru/upload_picture/ropogas.pdfIn PDF document text
- http://ymjgolf.com/file_media/file_image/file/32335049202.pdfIn PDF document text
- http://precisao.org/files/files/bamujinimap.pdfIn PDF document text
- http://nattukoottam.com/userfiles/file/funiwufubojedenoratuzofu.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff52ee302---94092353854.pdfIn PDF document text
- http://discus-rus.ru/upl/file/bifebeninofumoboposikif.pdfIn PDF document text
- http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/042122359520.pdfIn PDF document text
- http://ifap.it/images/file/timebaderebuludefilerisel.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4117145eb7d2dd5021318e3f676a4a13/zaripodosovuva.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_off0000b713.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB713	17792 bytes
SHA-256: `d0721a988906cf0115e645dedc591bd62d440ed8df11ad217ae5ad931a01f703`
`font_01_sfnt_off0000e5f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5F9	10332 bytes
SHA-256: `69d0164333315a4d1bb1f2a14dab208f3041d7a7aa3d3f0e5aef54b362f1c94e`
`font_02_sfnt_off0000fd34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD34	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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