PDF malware analysis — malicious · 91a7e0d86d601fd0

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 16:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: abf63bb506a846cb68ec2538620f780a SHA-1: fee0ed7979ae4d8da57765e7e13e541f39f24373 SHA-256: 91a7e0d86d601fd0cd5da0093c736ce50464c76212b3b896de7f956d5cfc1889

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript further supports malicious intent, likely to redirect users or exploit vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://coretry.ru/uplcv?utm_term=borderlands+3+couch+co+op+xbox+one PDF link annotation
- http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/15242632373.pdfIn PDF document text
- https://stl-log.com/htdocs/cljr/data/files/taxujugaluxeloliz.pdfIn PDF document text
- https://dammesliepas.lv/ckfinder/userfiles/files/62114545663.pdfIn PDF document text
- http://ministerium.pt/files/bosekanudiwe.pdfIn PDF document text
- https://volnynaklad.cz/data/file/58289206601.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0rk9kr1hotrbre9j1k85db7kel/63634618560.pdfIn PDF document text
- https://hgb.se/filer/file/rapajafeduwuxexowoxogi.pdfIn PDF document text
- https://xn--z4qq44i.xn--kpry57d/upload/actfiles/jofisoliwogurojupal.pdfIn PDF document text
- http://fge-service.com/userfiles/file/28544551707.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8b3cd3e809bcdd17d562d6e0bc153bd6/pepixodasijoxixetukuxefan.pdfIn PDF document text
- http://chanhungcorp.com/images/uploads/files/tagebaso.pdfIn PDF document text
- http://como.gattinonimondodivacanze.it/themes/userfiles/files/69673480187.pdfIn PDF document text
- http://banglenhospital.com/UserFiles/File/23031524836.pdfIn PDF document text
- http://redeyeldn.com/userfiles/file/finebugilabi.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/748110883.pdfIn PDF document text
- http://tareeapartment.com/user_img/files/lukofanemajexabujij.pdfIn PDF document text
- http://www.mariabeckmann.com/fotos/uploads/files/bawiponimupabulejagofov.pdfIn PDF document text
- http://aguito.madteam.net/ckfinder/userfiles/files/lobikug.pdfIn PDF document text
- https://larrialdiak.es/files/galeria/files/76994126951.pdfIn PDF document text
- http://www.badischer-kunstverein.de/ckfinder/userfiles/files/35417782839.pdfIn PDF document text
- http://bannails.com/fckeditor_userfiles/file/86838309708.pdfIn PDF document text
- http://omni-links.com/images/blog/file/rixemepixokirabewifov.pdfIn PDF document text
- http://clear-es.net/yamituki-n/uploads/files/95486166586.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_off0000d7cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFDE	17692 bytes
SHA-256: `87516f3860d7d2d1377c8ac91f7308ee52e3716b8710a0d9a72faaa07d9d2706`
`font_02_sfnt_off00011de6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DE6	10988 bytes
SHA-256: `28bb51ab783959a5edb21aa1c710e3cc95117f50c832aedba25112599f01bbe8`

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