PDF malware analysis — malicious · 1f9142db796b07a0

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 21:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 06fa607002a4b9074a4f9a37a1cdd873 SHA-1: 97855c6e68b4ef7ade785dba3cd9c1fd5c74eb71 SHA-256: 1f9142db796b07a0e2cadb9c6390f3b3a33cc841b78c1b18cd55671cb524631f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and external URI redirection. The PDF contains numerous links to external domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to host further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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 https://medvor.ru/uplcv?utm_term=essentials+of+management+by+harold+koontz PDF link annotation
- http://knowleangling.co.uk/ckfinder/userfiles/files/lamozidusutagexo.pdfIn PDF document text
- http://mtjjt.com/2013/upload/article/files/210902101158742463hrm5e.pdfIn PDF document text
- http://incomsistema.ru/ckfinder/userfiles/files/vurelekujapudenap.pdfIn PDF document text
- https://ispartaorganizasyon.com/ckfinder/upload/files/todedujirub.pdfIn PDF document text
- http://mwcapital.net/ckfinder/userfiles/files/ponuvosafojojuwi.pdfIn PDF document text
- http://globalsublimation.net/uploadfile/files/59297440320.pdfIn PDF document text
- http://hocomesun.com/upload/tovifulofalotikomefa.pdfIn PDF document text
- http://geometracosentino.com/userfiles/files/11933778428.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614214ef5612c---20195777102.pdfIn PDF document text
- https://businesslife.com/content/files/23079172840.pdfIn PDF document text
- https://4wheelchile.cl/admin/uploads/file/14207125239.pdfIn PDF document text
- https://lecormier-menuiserie.com/www/upload/files/godebewunivik.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/peromozazojur.pdfIn PDF document text
- http://abwbaltimore.com/uploads/files/salugosuzitevotijidolun.pdfIn PDF document text
- http://mtt-association.fr/upload/file/vefenimifonuruzav.pdfIn PDF document text
- http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/gibanusitinepuwagujazini.pdfIn PDF document text
- http://envigest.cz/upload/file/95563457048.pdfIn PDF document text
- https://djecijagarderoba.me/userfiles/file/12094184851.pdfIn PDF document text
- http://top-caster.com/userfiles/file/28530555817.pdfIn PDF document text
- https://micro-logic.ro/images/uploaded/file/19771421020.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140066821504---gemudo.pdfIn PDF document text
- http://lica.plovdivweek.com/js/ckfinder/userfiles/files/79815810076.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_off0000bc78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC78	16904 bytes
SHA-256: `63d0849d723aae20b32ef5fd891fae848d75684fb67c2f586f96cd09e62a8eae`
`font_01_sfnt_off0000e848.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE848	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001005f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1005F	11188 bytes
SHA-256: `c37b5a01173a58c82621d845a5846ab5a9497f716f42b284bb982af08bebf55d`

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