PDF malware analysis — malicious · b6732f82d9c2d9bc

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 01:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 29a81748632d3386cb6b1caa257a070e SHA-1: 0c31b0369de73482644c901163d11925004d9070 SHA-256: b6732f82d9c2d9bc8997f6f4b039b137a413577c34328c91efa1cfcdbf192ded

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=best+strategy+games+to+play PDF link annotation
- http://zensushidanapoint.com/uploads/files/8213246984.pdfIn PDF document text
- http://steelfurniturecn.com/d/files/fenogetefidoteral.pdfIn PDF document text
- http://residenceraffaellotorino.com/userfiles/files/83976942967.pdfIn PDF document text
- https://nepalihemp.com/ckfinder/userfiles/files/5629310207.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/784c88729fd5d92f42bab130a858d382/6966839957.pdfIn PDF document text
- https://espritgt.com/userfiles/file/11198343810.pdfIn PDF document text
- https://vico-inmobiliaria.com/ckfinder/userfiles/files/24715192524.pdfIn PDF document text
- https://tekdalyapi.com/upload/ckfinder/files/69068736265.pdfIn PDF document text
- http://guss-ex.de/uploads/fck/file/32003265533.pdfIn PDF document text
- http://tns-china.cn/editor_upload_image/file/85620232514.pdfIn PDF document text
- https://nibrasimansch.com/userfiles/files/63609096744.pdfIn PDF document text
- https://proia.bg/userfiles/file/dedefapo.pdfIn PDF document text
- http://longarmquiltingacadamy.com/fckeditor/userfiles/file/30175312509.pdfIn PDF document text
- http://viral-list-machine.com/ckfinder/userfiles/publics/files/87608109251.pdfIn PDF document text
- https://www.hippocratio.gr/ckfinder/userfiles/files/61704286902.pdfIn PDF document text
- https://cebrigantina.com/025-CEB/images-editor/file/vatejar.pdfIn PDF document text
- http://computerdoki.hu/user/file/89058996971.pdfIn PDF document text
- https://balajihighfields.in/userfiles/file/6891478582.pdfIn PDF document text
- http://frutapac.com/ckfinder/userfiles/files/73990613012.pdfIn PDF document text
- http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/92246497638.pdfIn PDF document text
- https://ayurmitra.com/files/file/19289273970.pdfIn PDF document text
- https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a487d43912cfaf784b776155aa82f180/redoraj.pdfIn PDF document text
- http://klpa.net/userData/board/file/soluvilotudatadubu.pdfIn PDF document text
- http://tranindo.com/Uploads/userfiles/files/nuwojavalabekoduke.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_off0000dd05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD05	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f517.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF517	17088 bytes
SHA-256: `3f0a4ea2c588a9b2ab95a931d758d0927689a3c9b9dd0b78e55c64875a3a6d07`
`font_02_sfnt_off0001213b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1213B	10568 bytes
SHA-256: `602e31d413f19e43269f1c878f42a2e755c94cb532e4bd47f104585ed9a09a6c`

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