PDF malware analysis — malicious · e5d34add5b16e6a2

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 22:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6645925a13507c65b2aa936e04689a63 SHA-1: 8f5d2438a981b869a09b49fdeb89864fc5f24b75 SHA-256: e5d34add5b16e6a24122f345474982eabc357880bb19f86738fcb43afde4f5ca

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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=sygic+full+android PDF link annotation
- http://fotosvatba.net/userfiles/file/batukabunox.pdfIn PDF document text
- https://kitapkaplama.com/upload/ckfinder/files/xeserodebiterelera.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5d2491aa5098fde7d95c7f32c2e78c67/zudoze.pdfIn PDF document text
- http://jinyezi.cn/upload/mepifepizimime.pdfIn PDF document text
- http://oa30us.com/userfiles/file/tiriwosagakidozewugiku.pdfIn PDF document text
- http://kleinschaden-expert.de/userfiles/file/wogodinukuloruxodijuti.pdfIn PDF document text
- http://citadelcaralarms.com/userfiles/file/33662693215.pdfIn PDF document text
- http://congluc.com/upload/files/goronotisel.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/wawebipalujopanolo.pdfIn PDF document text
- http://ryyw.com/upload/files/2021/09/202109041325307320.pdfIn PDF document text
- http://syntra.pl/userfiles/file/70869076391.pdfIn PDF document text
- http://fjzy18.com/image/uload/files/65378966234.pdfIn PDF document text
- http://littlepearlspublishing.in/data/eimages/file/noxaxuf.pdfIn PDF document text
- http://interroadholland.nl/userfiles/file/jejujozekijajatofad.pdfIn PDF document text
- https://myphambambi.com/webroot/img/files/zizagakexosel.pdfIn PDF document text
- http://hani-bee.com/userfiles/files/sepepem.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a91135ee5a9933908eeb210b22bb9f34/89222251082.pdfIn PDF document text
- https://ibliberia.com/ckfinder/userfiles/files/75471471390.pdfIn PDF document text
- http://ks4073.com/file_media/file_image/file/mizalitusujebafedijaruso.pdfIn PDF document text
- https://onsale.social-push.cc/data/fckeditor/files/sewemugepulilutexitekesuk.pdfIn PDF document text
- https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/watesatamugalefabat.pdfIn PDF document text
- https://dcoderesearch.com/uploads/bizegiwigakaked.pdfIn PDF document text
- http://ameshamagazine.com/js/upload/files/49797886895.pdfIn PDF document text
- http://www.morrisjones.co.uk/EditorImages/file/xaxibesusakoxafufivipujo.pdfIn PDF document text
- http://eamenfaraz.com/cache/fck_files/file/1378344054.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_off0000c4a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4A1	10540 bytes
SHA-256: `0b87c865f56abd856a3c69c1433582cc10bce8e0e7f9863a1ceac647110d929f`
`font_01_sfnt_off0000dc88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC88	19272 bytes
SHA-256: `285dd9c73b18bcd3651214f799bb1475fd43e132ca097493975681f9d1605b10`
`font_02_sfnt_off00010e64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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