PDF malware analysis — malicious · b9dd21279688098e

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 12:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ba4d99808c0802e829851ffc4414c712 SHA-1: 54f88600b5f00137e3484e357d8a2fbd9e359f8e SHA-256: b9dd21279688098e3b2dd051b139a0d9ae79c8ac019fd6ac234698531173090b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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 http://stigstudiotecnico.it/userfiles/files/53707930940.pdf In PDF document text
- https://jxlmedu.com/file/files/20210919_081848.pdfIn PDF document text
- http://ukkies.be/userfiles/file/12620049712.pdfIn PDF document text
- https://educationindiajournal.org/ckfinder/userfiles/files/sixagezatuko.pdfIn PDF document text
- https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/kavifurinakuro.pdfIn PDF document text
- http://tubesealer.com/uploaded/file/8132563656133b8eea295a.pdfIn PDF document text
- http://hstechno.com/userData/ebizro_board/file/37288872874.pdfIn PDF document text
- https://burragebrothers.com/demo/jolie/beta/userfiles/files/meduvotik.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dca09600d---danilipumaxudunibixujo.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba0b82fa2---82320664005.pdfIn PDF document text
- http://piotrkowska77.pl/zdjeciafile/59435063842.pdfIn PDF document text
- http://mibenjamin.com/userfiles/file/89321965097.pdfIn PDF document text
- http://delfosventures.eu/userfiles/files/79210233058.pdfIn PDF document text
- http://artecgroupservices.com/imagenes/file/lizoxitabigojatibuguna.pdfIn PDF document text
- http://vizugy.hu/uploads/files/files/xizewikomukusu.pdfIn PDF document text
- https://dansobentre.net/uploads/file/govokamumuwilabaz.pdfIn PDF document text
- https://ldcpc.com/ckfinder/userfiles/files/momolifakarovupamewijaxa.pdfIn PDF document text
- http://a899.net/userfiles/file/xesepev.pdfIn PDF document text
- https://mallncart.com/userfiles/files/73806007864.pdfIn PDF document text
- http://0575zl.com/userfiles/file/lowesupubak.pdfIn PDF document text
- https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/mogejivotiwukugusitawol.pdfIn PDF document text
- http://ohadalegistrocbarter.com/ckeditor/uploads/files/nisawivupezoxedopo.pdfIn PDF document text
- https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/90387025276.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=super+mario+bros+deluxe+romPDF 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_off0000c40a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC40A	18484 bytes
SHA-256: `dcbf4db550b847b322cbaf97622d7d29cdaf8109db59f590425692d89a48616a`
`font_01_sfnt_off0000f372.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF372	10768 bytes
SHA-256: `18291e5aed2d7eb0992857df7d3e105862ad92b556db5bfbde42030d607d8a25`
`font_02_sfnt_off00010bf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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