PDF malware analysis — malicious · 3c0c63d89b71a0e1

MALICIOUS

PDF

72.4 KB Created: 2021-09-10 23:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ec7e205527686040993e57cae0fc77a1 SHA-1: 2df05f0ef52b695e81b68b2ec6b0c4c5c7fe4c22 SHA-256: 3c0c63d89b71a0e1cdddc3a599be6fb7bc20133b631276de10f95e9ef4f945ee

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, 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 on disposable hosting, often used for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=hack+wifi+kali+linux+without+wordlist PDF link annotation
- http://assessmentinsight.com/ckfinder/userfiles/files/65462329210.pdfIn PDF document text
- https://hchoanglong.vn/userfiles/file/joxiwawoketuzisiwe.pdfIn PDF document text
- http://sowa-architekci.pl/userfiles/files/zikexejizemij.pdfIn PDF document text
- http://kfnmdg.com/upfolder/e/files/20210902164944.pdfIn PDF document text
- http://hasanmasat.com/ckfinder/userfiles/files/losugatutenopokejuleju.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630518397.pdfIn PDF document text
- https://spacio.hk/attachment/file/wewewazareja.pdfIn PDF document text
- https://penzion-pod-rozhlednou.cz/img/file/21403754166.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/62909215149.pdfIn PDF document text
- http://verynailscm.com/user_img/file/legokodorovodaxusewexeg.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c369e6fcb1d2441bd19eb60f344dc003/wakabafofav.pdfIn PDF document text
- https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/depeguj.pdfIn PDF document text
- http://taeguektour.com/FileData/ckfinder/files/20210904_8DCCDA3675CD86E3.pdfIn PDF document text
- http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/71463721855.pdfIn PDF document text
- https://comptables-publics.fr/userfiles/file/tuvujemoro.pdfIn PDF document text
- http://kaitosushisb.com/uploads/files/famusokikifagegevaba.pdfIn PDF document text
- http://0975811252cool.linker.tw/files/45389658676.pdfIn PDF document text
- http://www.kotolantopeni.cz/files/vebuvogokukunalukozexol.pdfIn PDF document text
- http://canadianartistic.com/userfiles/file/44318139734.pdfIn PDF document text
- https://cartolmania.it/file/lezeg.pdfIn PDF document text
- http://alompar.hu/uploads/content_files/files/merojofanegubuvugamobafu.pdfIn PDF document text
- https://markiza-trade.ru/admin/ckfinder/userfiles/files/3365986836.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/35a1e22e26192d8145d7dff0df636fa4/sovefivere.pdfIn PDF document text
- http://tivati.com/uploads/userfiles/file/48165887630.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_off0000b740.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB740	10812 bytes
SHA-256: `0ad6330315d755aaca3a376bd8598cd15ae112ac5599c843ed982b84e4f53221`
`font_01_sfnt_off0000d023.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD023	16932 bytes
SHA-256: `015bed64305552e1c31981b64c9b3a7533635c7742176bcc8b3329024a23a6b2`
`font_02_sfnt_off0000fba8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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