PDF malware analysis — malicious · 270ef0cdbbabb4c3

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 14:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 5a21bef2d31cf80f344192f977cd86dd SHA-1: 6df3b87e2a5ba96efbf164d39cc0a09f77663b89 SHA-256: 270ef0cdbbabb4c32be0a88a64ae8b1213d886aa606e8fb0e4d09a01adabc5de

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://tayles.com/uploaded/zapabowa.pdf In PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c12694ea0---sulifusigowerelumurodi.pdfIn PDF document text
- http://benthanhsgfarm.com/images/uploads/files/fifopirodekovemexesujogi.pdfIn PDF document text
- https://landtop.com/filespath/files/20210909002532.pdfIn PDF document text
- https://discovery99.com/userfiles/file/11051834527.pdfIn PDF document text
- https://clearpatth.com/userfiles/file/8675418188.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b33bd17d---78847483347.pdfIn PDF document text
- https://vatlieutaphu.com/upload/files/domibojafokijotazunaxe.pdfIn PDF document text
- http://metrocars.london/survey/userfiles/files/xisagerumopefodaruzu.pdfIn PDF document text
- http://julianina.de/upload/file/gokalunegoxitaraviwewatit.pdfIn PDF document text
- http://alfadent-volg.ru/images_uploads/files/zizex.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/39322072394.pdfIn PDF document text
- http://harissarantis.com/userfiles/files/86971527872.pdfIn PDF document text
- https://superpackeg.com/userfiles/file/rukekifurewivuwumudan.pdfIn PDF document text
- https://luxesystem.site/js/ckfinder/userfiles/files/793323648.pdfIn PDF document text
- http://king-ber.com/UploadFiles/file/20210905084813778.pdfIn PDF document text
- http://heathrowairporttaxi.website/userfiles/file/jivijokuniseliwubipapi.pdfIn PDF document text
- http://enricobarraco.com/files/kojudegigojatatilavin.pdfIn PDF document text
- http://sarkar.ie/userfiles/file/mesagujoxevus.pdfIn PDF document text
- http://portalcom-b2b.es/img/user//file/_0948053001630826316.pdfIn PDF document text
- http://mikol-styl.cz/userfiles/file/jobesagubafeludizuzuvimab.pdfIn PDF document text
- http://qlinairnv.be/userfiles/file/12819916025.pdfIn PDF document text
- http://tabouligrill.com/ckfinder/userfiles/files/97344510386.pdfIn PDF document text
- http://bandbaajabarat.com/ci/userfiles/files/kemifaradejizag.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=123movies+mobile+sitePDF 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_off0000eaa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA2	10356 bytes
SHA-256: `d10cc0a98c3bc1bd487b80c29a37d70c456f842403a2b75d037dfad9e194233c`
`font_01_sfnt_off00010223.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10223	17624 bytes
SHA-256: `e0dae36b7e7b6863247a71fcc90239c23ef8af129af0aa7fb778c2ae0ecdce15`
`font_02_sfnt_off00013016.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13016	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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