PDF malware analysis — malicious · 916b6f6f22707f61

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 01:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 68f23a1393c3fe7513c9911431864334 SHA-1: aaeaad8c8ae0048fdd8dc812abba19572f4ab2fe SHA-256: 916b6f6f22707f61c7645bfbb134a0240b46da41ce99be7e71494acdeff97925

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also contains numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external links, which are probably used for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b73ef1bf2---41551214212.pdf In PDF document text
- https://niagarablock.com/application/webroot/userfiles/file/35928482794.pdfIn PDF document text
- https://www.almuhja.com/ckfinder/userfiles/files/puseba.pdfIn PDF document text
- http://kramor.bg/userfiles/file/nenavemaropixizame.pdfIn PDF document text
- http://arredamenticucinesiciliane.it/userfiles/files/36084819042.pdfIn PDF document text
- https://funbugs.ie/files/file/dulibaporerexes.pdfIn PDF document text
- http://theorientgarden.iorderfoods.com/uploads/files/mevupibubafavokewajoni.pdfIn PDF document text
- http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagesulukorusubalu.pdfIn PDF document text
- http://jeansresource.com/js/ckfinder/userfiles/files/56572481361.pdfIn PDF document text
- http://joltiy.ru/uploads/files/baxezasoxujow.pdfIn PDF document text
- http://gusanhightec.com/userData/board/file/62358698351.pdfIn PDF document text
- https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mabusagusoropawit.pdfIn PDF document text
- http://nhatrangpalace.vn/app/webroot/upload/files/77753054079.pdfIn PDF document text
- http://ehomeforeclosure.org/images/file/60733044147.pdfIn PDF document text
- http://dgjinhak.kr/DATA/upload/files/202109080701377102.pdfIn PDF document text
- http://serdceprirody.ru/userfiles/file/ruvaj.pdfIn PDF document text
- http://driscollandgibson.com/images/edit_images/file/kojosukofuluxavikumevo.pdfIn PDF document text
- https://fishuntpesca.it/file/23354948776.pdfIn PDF document text
- http://studiolorenzino.eu/userfiles/files/wufabupifurufupol.pdfIn PDF document text
- https://annekienlen.fr/imagesfile/43659094999.pdfIn PDF document text
- http://ohmytour.kr/FileData/ckfinder/files/20210912_E8ACAD79EDE51B3D.pdfIn PDF document text
- https://associazionemusicaviva.it/uploads/file/98183829006.pdfIn PDF document text
- http://shrlie.com/upload_fck/file/2021-9-9/20210909040235746764.pdfIn PDF document text
- https://noriupapildu.lt/ckfinder/userfiles/files/fabelevi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sega+emulator+android+multiplayerPDF 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_off0000db5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB5D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f374.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF374	10856 bytes
SHA-256: `db3fdbc8b6b420731a2eefeac26c0492ba74baef4d5a4c0dc199851bf8efb060`
`font_02_sfnt_off00010c4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C4C	17932 bytes
SHA-256: `0214b23ae4c3ca0f8bb4e26ef505fe45ecdbdf1d75d0440888061dc44937d9be`

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