PDF malware analysis — malicious · c079209b92815c80

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 10:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 5cf6c81ea58774fb409997f9eac3439a SHA-1: f5157340e047599b0886382b58a6ccaafce9a8a0 SHA-256: c079209b92815c80e58439d7296a2d1054caf8837fd6f56b54ef1a85d4a70530

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. The numerous embedded URLs suggest it may be part of a link farm designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://inwebjor.ru/uplcv?utm_term=file+def+jam+ppsspp PDF link annotation
- http://patrick-vallot.com/upload/files/4315873989.pdfIn PDF document text
- https://rosanaalvarracin.com/userfiles/file/71809174800.pdfIn PDF document text
- http://alt-1c.ru/userfiles/file/duziwuregizidaju.pdfIn PDF document text
- http://roberthalasz.eu/uploads/file/kerelawuj.pdfIn PDF document text
- http://asiavent.com/UserFiles/file///18521467577.pdfIn PDF document text
- http://crystal-lamp.ru/uploads/files/xiwerupevolofigator.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/80267894392.pdfIn PDF document text
- http://info56.ru/userfiles/file/36409305564.pdfIn PDF document text
- http://cp-1.ru/userfiles/files/kuvomudebatised.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/jijutenidapetekosodoz.pdfIn PDF document text
- http://cisseo.net/userfiles/files/70316585431.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/47691111964.pdfIn PDF document text
- http://kasargod.net/uploads/file/53521669686.pdfIn PDF document text
- http://neuroxl.com/images/file/moroxar.pdfIn PDF document text
- https://beldaoyun.com/calisma2/files/uploads/90723583231.pdfIn PDF document text
- http://falegnameriacastiglione.it/userfiles/files/1732053015.pdfIn PDF document text
- https://bikeid.net/ckfinder/userfiles/files/753118534.pdfIn PDF document text
- http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/80109008880.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/71236919876.pdfIn PDF document text
- http://metapolar.hu/tmp/suzavimowawepideji.pdfIn PDF document text
- http://podwierzba.eu/ckfinder/userfiles/files/woxetelufugibulogefunoja.pdfIn PDF document text
- https://hantverkarenisandby.se/UserFiles/files/29446810147.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba77ac632e---timavolomowu.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/jidezuroluk.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_off0000b0ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c8dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8DC	18180 bytes
SHA-256: `f10703bef29aeb617ec4566d5b017a2577f58980ba6f040c718fbc752cb04a70`
`font_02_sfnt_off0000f889.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF889	10344 bytes
SHA-256: `0f6789ef43bc9ce3daca0e0079ee3169dfbcab300a2e034375928cfb3b1fe998`

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