PDF malware analysis — malicious · d4d41c43fada7f4f

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 02:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 799f5faa9c03834fd00157c4908a2a9c SHA-1: 6680c0609ce5aa11f239fb432df1bfcfd88b25be SHA-256: d4d41c43fada7f4f9136176642dc04bd4d1a7f6851113c2a92adf220a68741ba

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, and multiple external URIs were extracted, suggesting a redirection to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or distribute further malware.

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=best+video+converter+for+android+apk PDF link annotation
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/36798848068.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8c7cg6bh4bvcf1vn6qbk7tmuej/99567635417.pdfIn PDF document text
- http://home-plast.ru/foto/files/4365264402.pdfIn PDF document text
- https://asken.as/bilder/file/62051098364.pdfIn PDF document text
- https://beeshark.ro/app/webroot/files/userfiles/files/68749962656.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/potukirexokitonabus.pdfIn PDF document text
- http://yenidenyuzlendirme.com/ckfinder/userfiles/files/zejosukedabodomip.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ee5c7e2---68501898876.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613654c040fcf---woxoti.pdfIn PDF document text
- http://premiercontractinginc.com/files/file/26691997751.pdfIn PDF document text
- http://vencedor.coop/images/admin/file/45653031304.pdfIn PDF document text
- http://paykaaluminiya.ru/ckfinder/userfiles/files/66270784193.pdfIn PDF document text
- http://rhondachem.com/d/files/96421336693.pdfIn PDF document text
- http://isotope3.pm-ural.com/uploads/files/gabemapiferaditavedos.pdfIn PDF document text
- https://millersexpress.com/userfiles/file/87287491173.pdfIn PDF document text
- https://hotararicedo.ro/files/files/3194503803.pdfIn PDF document text
- https://asi-filter.pl/files/file/bakuxovijigixi.pdfIn PDF document text
- http://yunnanyingxiang.com/ckfinder/userfiles/files/kujijadunukofenekive.pdfIn PDF document text
- http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/34075824368.pdfIn PDF document text
- https://papiratisk.cz/soubory/17754398342.pdfIn PDF document text
- http://geteffective.biz/uploadfiles/file/9542937680.pdfIn PDF document text
- http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
- http://dothi.info/images/files/bawirikesufoxikotomumokof.pdfIn PDF document text
- https://jamisonfurnace.ca/userfiles/files/73963636592.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_off0000c84c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC84C	10776 bytes
SHA-256: `c82b72d39f4a382c66e46a7646ba04a3a2276b6acdb97cf98d13426c8b2bc4ce`
`font_01_sfnt_off0000e153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE153	17272 bytes
SHA-256: `2ba6c1f32c371f9f7fb2572d36b6e8dc83c9e261f4cb384d371a140369993271`
`font_02_sfnt_off00010e8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E8A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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