PDF malware analysis — malicious · cfb6362f52878309

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 11:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: fdb12df9b990d4e37c9f1448a8a675db SHA-1: e457ad767a129aa67d31e917e45b65b12f837340 SHA-256: cfb6362f528783097ffdb7794adc29681765496bf57c4e30630a8948cb42923d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and multiple external URIs, with one heuristic indicating a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF, likely to redirect the user or download additional malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://daisin1977.com/js/upload/files/35397482483.pdf In PDF document text
- http://lor-rostov.su/userfiles/files/87015258304.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/jasajetiwiriradekamowebe.pdfIn PDF document text
- http://greddy.com/admin/common/ckfinder/userfiles/File/2010575045.pdfIn PDF document text
- https://china-glass-mosaic.com/userfiles/files/20210907_143832.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/49823221054.pdfIn PDF document text
- http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/gepizemumevivuzosuxiluf.pdfIn PDF document text
- https://dodomacnosti.net/data/file/85935335420.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b1c46a340---37093545912.pdfIn PDF document text
- http://ecogestval.com/userfiles/file/limovovamuxefezezirevewiw.pdfIn PDF document text
- http://thedewakohchang.com/image/upload/File/exesedigax.pdfIn PDF document text
- https://deshpanday.com/ckfinder/userfiles/files/guzakuroxag.pdfIn PDF document text
- http://sjhrz.com/images/upload/File/56284162265.pdfIn PDF document text
- https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/garoxumavekubarez.pdfIn PDF document text
- http://bahtiyardishekimi.com/fckfiles/file/38171841.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/vojararutu.pdfIn PDF document text
- https://leo.tw/upload/ckeditor/files/45848922125.pdfIn PDF document text
- http://movesearchesuk.com/userfiles/file/66308749155.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/files/novakabopubir.pdfIn PDF document text
- http://boletos.luzservicos.com/ckfinder/userfiles/files/gasijus.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/64531742731.pdfIn PDF document text
- https://lemarko.com/userfiles/file/61245551029.pdfIn PDF document text
- http://ardeche.proximeo.com/ckfinder/userfiles/files/genepetufuwakadazupopide.pdfIn PDF document text
- http://falconartistmanagement.com/ckfinder/userfiles/files/28570347814.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=anthropoid+watch+onlinePDF 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_off0000d64d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD64D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE5F	17844 bytes
SHA-256: `a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645`
`font_02_sfnt_off00011c80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C80	10512 bytes
SHA-256: `900e3a3ec517ad1b0c0bc6c19f6bb95cf4318fc929290226697e2921e57f1f3f`

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