PDF malware analysis — malicious · 82257441d1aef377

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3c60a8ebd1b380fccd68bee8dae7e622 SHA-1: d10c14b7f6c47d3a4505b0529a0e9fd2e1a64dc3 SHA-256: 82257441d1aef37703fab0ea13d03154e47a5c1b6002ef4711a412c9a9bd0a4f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier output of 0.991746 further supports the malicious nature of the file. The primary attack pattern involves luring users to external sites, likely to harvest credentials or deliver further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 5

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.
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://ketchas.ru/uplcv?utm_term=convert+webpage+to+pdf+chrome+extension PDF link annotation
- http://textingrights.com/userfiles/files/20594610477.pdfIn PDF document text
- http://lateonsettay-sachs.org/userfiles/file/17024794051.pdfIn PDF document text
- http://tiszaikaland.hu/upload/file/59634473621.pdfIn PDF document text
- http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/36536263963.pdfIn PDF document text
- https://frutalmente.pt/site/upload/file/549736604.pdfIn PDF document text
- https://orangcar.com/app/webroot/upload/files/jotadejarodivalegezopaz.pdfIn PDF document text
- http://mayjack.com/upload/files/migiwaxemis.pdfIn PDF document text
- https://berbagiangka.com/contents/files/68622381056.pdfIn PDF document text
- http://irk-yoga.ru/upload/files/lugolij.pdfIn PDF document text
- http://kirsanov-maslo.ru/uploads/47066440089.pdfIn PDF document text
- http://mjacz.cz/soubory/files/jezowezidezo.pdfIn PDF document text
- https://safetypadlocks.eu/eurostyl/photos/file/betekadukedorox.pdfIn PDF document text
- http://www.europesolidaire.eu/userfiles/files/46114137437.pdfIn PDF document text
- http://avtokit116.ru/!upload/files/pedabosumenorebonajawuse.pdfIn PDF document text
- https://trvstore.com/userfiles/file/75667308054.pdfIn PDF document text
- http://tecsun-moscow.ru/docs/file/filejosapalobuwolipu.pdfIn PDF document text
- http://ilonew.tasksplan.com/ckfinder/userfiles/files/99733116883.pdfIn PDF document text
- http://trip-sale.ru/userfiles/file/93668758559.pdfIn PDF document text
- https://egyptsuntours.com/userfiles/files/77954134795.pdfIn PDF document text
- https://horacebatten.com/ckfinder/userfiles/files/wefirosex.pdfIn PDF document text
- http://www.sport-konyv.hu/userfiles/file/60361224550.pdfIn PDF document text
- http://tupnate.com/ckfinder/userfiles/files/sedaxinonepadakewasi.pdfIn PDF document text
- http://lotusburbank.com/uploads/files/20403812860.pdfIn PDF document text
- http://vaikevai.com/ckfinder/userfiles/files/javot.pdfIn PDF document text
- http://coomargroup.com/ckfinder/userfiles/files/134486901.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16147a630b1c2f---fuwibujuvovu.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_off0000ddd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDD3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5EA	11448 bytes
SHA-256: `d8aa66973381768df6075620082f2a4085a7a0f0d9e6bbebd531a3111148f615`
`font_02_sfnt_off00011079.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11079	16220 bytes
SHA-256: `28dcb5385d13a23c03400b8d672361472c69a26b1fd89c05365d1cec7648273f`

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