PDF malware analysis — malicious · c29a23526e8553bc

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 21:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a303fa558bcb2d779634e912ab9e9607 SHA-1: 381292425afdbb67439637b66fbd844409aa6d0e SHA-256: c29a23526e8553bc2f4f78a81ab2117bf23752a804068c9f5361b1923fa62b31

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and the presence of numerous external URIs, including one pointing to 'picassogift.com', suggests a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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://picassogift.com/Uploadfiles/files/12294828785.pdf In PDF document text
- http://www.dreamstoreonline.es/ckfinder/userfiles/files/71549156860.pdfIn PDF document text
- http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/55807240106.pdfIn PDF document text
- http://alburigiott.it/userfiles/files/82434172498.pdfIn PDF document text
- http://jiuxingchaoshi.com/uploads/file/090105339288.pdfIn PDF document text
- http://np-laser.com/upload_fck/file/2021-9-5/20210905223838315619.pdfIn PDF document text
- https://kristinanamaste.eu/files/59719162002.pdfIn PDF document text
- https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/bovuzuwigajepajivulozo.pdfIn PDF document text
- https://defi128.phpascal.com/userfiles/files/gaxukexedonudoronolurabur.pdfIn PDF document text
- http://hondatayho.top/img-ngocbao/files/35962644212.pdfIn PDF document text
- https://adverto.ee/userfiles/file/14885192079.pdfIn PDF document text
- http://pretaporter-pegah.com/userfiles/file/fedepu.pdfIn PDF document text
- http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/18499430917.pdfIn PDF document text
- http://hockeydh.com/files/ups/files/sezitetepatasexetonoxaj.pdfIn PDF document text
- http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/merogibif.pdfIn PDF document text
- http://hzbmsj.com/images/upload/File/nunamugixoxisopikiketaza.pdfIn PDF document text
- http://betheaskssd.com/flash/betheaskssd.com/file/fezerikakazizizimefonexi.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5b7da822---zezajiralakuwulisekadij.pdfIn PDF document text
- https://alkoplast.rs/files/remeson.pdfIn PDF document text
- http://jessie.vn/images/ckeditor/files/laxazajibi.pdfIn PDF document text
- http://yksskj.com/ckfinder/userfiles/files/bexosapofuju.pdfIn PDF document text
- http://sinoscaform.com/upload/ckimg/files/202109090248589337.pdfIn PDF document text
- https://eseninternational.com/uploads/files/95000261816.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/fugemexub.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=business+research+methods+bryman+and+bell+pdfPDF 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_off0000c9b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9B6	11292 bytes
SHA-256: `bce3fdda52e58e778c9b29650e78d2432d491676544d7a43c7ac48519507911f`
`font_01_sfnt_off0000e3e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3E2	17776 bytes
SHA-256: `1e030077fd17c7ea931d3659c83c455492d80ecb8939b7e49167e56c65471302`
`font_02_sfnt_off000111e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111E7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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