PDF malware analysis — malicious · c496325c787ae64b

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 12:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a28bb4de7366a7d435930fb7fb16560c SHA-1: b9ec79ac36304c765071bce88777098b0c2d6930 SHA-256: c496325c787ae64b16aa4682ab9cbd8b056f21621c973de8ce790f2256fde391

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF's structure suggests it's designed to lure users to malicious sites, as evidenced by the numerous external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The embedded JavaScript is likely responsible for initiating the redirection to these external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://www.anclupnapoli.it/userfiles/file/23015821097.pdf In PDF document text
- http://fuyu.010bi.com/ckfinder/userfiles/files/90150707631.pdfIn PDF document text
- http://jevades.com/aircraft/fckimages/file/pemipukewulaxipozowuxajik.pdfIn PDF document text
- http://hanmih.com/userfiles/file/20210908080747.pdfIn PDF document text
- http://costruzionibulagna.it/userfiles/files/97664575357.pdfIn PDF document text
- http://intertexmedical.com/userfiles/files/webudujakaganetizated.pdfIn PDF document text
- http://hitplus.eu/userfiles/file/sopumaloz.pdfIn PDF document text
- https://yuvasarkar.org/userfiles/file/kularinapek.pdfIn PDF document text
- http://ecohort.com/userfiles/files/87679823567.pdfIn PDF document text
- http://www.ecvbrass.ch/user/web/file/remunelujovibafulid.pdfIn PDF document text
- https://rent-1.es/ckfinder/userfiles/files/64922351443.pdfIn PDF document text
- http://krukaiart.com/userfiles/files/94877607361.pdfIn PDF document text
- https://ofertaromania.ro/ckfinder/userfiles/files/90818189906.pdfIn PDF document text
- http://oecschool.com/userfiles/file/57408672746.pdfIn PDF document text
- http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawedozutorenojexiw.pdfIn PDF document text
- https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lafapajebekanulitetoku.pdfIn PDF document text
- http://kursadowicz.pl/Upload/file/983475251.pdfIn PDF document text
- http://prograsifkalip.com/files/wolidadoxaxitune.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/mavojipibu.pdfIn PDF document text
- http://timnhanhonline.vn/upload/files/44778076655.pdfIn PDF document text
- http://ekstelekom.com/userfiles/file/fomaxajelal.pdfIn PDF document text
- https://dagvandearchitectuur.be/_files/file/felawenejaludej.pdfIn PDF document text
- http://oembag.com/uploads/files/202109090549599801.pdfIn PDF document text
- https://www.alitec.es/js/ckfinder/userfiles/files/kedipomaf.pdfIn PDF document text
- http://dworbieland.pl/userfiles/file/16650301006.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hello+neighbour+game+download+apk+obbPDF link annotation
- 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_off0000b3d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cbeb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBEB	18376 bytes
SHA-256: `fcec99832e3ca5489823c023bce83f707576bbc941cf7bd6cc7f50e86c6595a0`
`font_02_sfnt_off0000fa10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA10	10980 bytes
SHA-256: `f00565b58ada1cef62a4d47b18562ca476c79c074e5d2d5cba91dbcb774752f7`

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