PDF malware analysis — malicious · 98ba24d123d4e3e3

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 22:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b4281e16a6e86fffedd54a5d1f217887 SHA-1: 46079c733d73b708868f7902c82f94b112ba7891 SHA-256: 98ba24d123d4e3e34aa0802c21b3f6028be90b9687fd2fbc4ed0cf89e9720bfb

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure aimed at obscuring the true destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://reazfarah.com/ckfinder/userfiles/files/36121554643.pdf In PDF document text
- http://perchegouet.com/ckfinder/userfiles/files/wotamejonigugorewilazu.pdfIn PDF document text
- http://ptichile.cl/userfiles/file/watomegadodefifuzokoxe.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7034e51a---8584990540.pdfIn PDF document text
- https://www.larche-de-jules.fr/ckfinder/userfiles/files/36402682096.pdfIn PDF document text
- http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9212425990.pdfIn PDF document text
- http://uptownchantilly.com/uploads/files/mefalisofino.pdfIn PDF document text
- http://banglenhospital.com/UserFiles/File/92571598485.pdfIn PDF document text
- http://jvcc.cn/ckfinder/userfiles/files/21090509321095425078xbx.pdfIn PDF document text
- http://poketomecam.com/uploads/files/zoneludarum.pdfIn PDF document text
- http://sovaimm.it/userfiles/files/wometodedodetiji.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70e78cdf2---jovokabades.pdfIn PDF document text
- http://dlastudenta.org/Upload/file/fiwukomovaz.pdfIn PDF document text
- http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/71347558572.pdfIn PDF document text
- http://dralituncer.com/userfiles/file/sekexipuxilofuvona.pdfIn PDF document text
- http://architettoseneca.com/userfiles/files/rirorip.pdfIn PDF document text
- http://flyingkirin.com/uploadfiles/file/112220288032.pdfIn PDF document text
- https://oncallanatomist.com/ckfinder/userfiles/files/73894721605.pdfIn PDF document text
- https://ijtm.in/userfiles/file/13434326320.pdfIn PDF document text
- http://hotelclinton.it/userfiles/files/mibigiximuwasurik.pdfIn PDF document text
- http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/momomelaxuve.pdfIn PDF document text
- http://tdsns.ru/userfiles/file/riganipore.pdfIn PDF document text
- https://cqc-material.com/app/webroot/userfiles/files/22851859650.pdfIn PDF document text
- http://gernano.eu/gfx/userfiles/files/28689905248.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mad+town+online+unlimited+moneyPDF 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_off0000e7e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7E4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fff6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFF6	17544 bytes
SHA-256: `2f251d345f83f07da225faa31662a3c4f61a22ca3330ba9797b45d50077c7d17`
`font_02_sfnt_off00012d0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D0C	10432 bytes
SHA-256: `8756d67a165a7a28e06c23939345a24dc52a2ef558fcbdfab70ffa8e3d83b866`

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