PDF malware analysis — malicious · c53f5147b2904691

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 06:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 130fa43cfe240cc139ae51d1327e8e06 SHA-1: 9f3c537a57a0f462d1e19d315d476fcb18a89b77 SHA-256: c53f5147b29046919caa77f20ebcae1ba6df5a08ce8651a920fc1ff39accffb2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with a high ML score. The presence of embedded JavaScript and a large number of external URIs, many pointing to potentially disposable domains, indicates a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a link farm designed to obscure malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://daindnc.com/fckeditor/userfiles/file/68158559570.pdf In PDF document text
- http://vhshf.de/File/zedimar.pdfIn PDF document text
- https://equinox-e.com/upload/files/lozarixekedisis.pdfIn PDF document text
- http://bertrandetgastineaudesigners.fr/userfiles/file/kukozadiwigogugi.pdfIn PDF document text
- http://weldingplaza.com/files/file/85012628098.pdfIn PDF document text
- http://pietrek.com/MARCUS/files/file/bojuxufojolo.pdfIn PDF document text
- https://altstudio.be/app/webroot/uploads/file/55609663348.pdfIn PDF document text
- http://www.ks-klinika.ru/ckfinder/userfiles/files/15519306292.pdfIn PDF document text
- http://puginternational.com/ckfinder/userfiles/files/98164845370.pdfIn PDF document text
- http://homespakistan.net/magzine/uploadfiles/file/14242582974.pdfIn PDF document text
- https://perfecthospitals.com/FCKeditor/file/13438187354.pdfIn PDF document text
- https://lodoshosting.com/calisma2/files/uploads/wovuzofepubofidekunaxex.pdfIn PDF document text
- http://infinity-c-t.com/userfiles/file/bufagevetarukejiwelefuli.pdfIn PDF document text
- http://www.tamtrebinhminh.com/public/files/26486777529.pdfIn PDF document text
- http://peach2560.xyz/js/ckfinder/userfiles/files/87185606121.pdfIn PDF document text
- https://eric-parnes.shortex.com/ckfinder/userfiles/files/88233823668.pdfIn PDF document text
- http://nasledie-sluck.by/var/upload/file/powekakilofuti.pdfIn PDF document text
- http://ubytovani-budejovice.cz/picture/vtextu/file/govezapuwomubagavisazatez.pdfIn PDF document text
- http://libron.pl/fckupload/assets/file/72996902902.pdfIn PDF document text
- http://lamekatus.ee/uploads/ckeditor/files/bavowekenodur.pdfIn PDF document text
- http://asustainable.com/global/file/66200050649.pdfIn PDF document text
- http://profesniprukaz.cz/ckfinder/userfiles/files/99138380795.pdfIn PDF document text
- http://yesilderecine.com/admin/editor_resim/file/vazarodomilibuneba.pdfIn PDF document text
- https://smobiil.eu/userfiles/files/28113985052.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+apk+5PDF link annotation
- http://s292376414.onlinehome.fr/datas/imgmail/file/ralepuwumowibat.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_off0000b4f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4F3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cd0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD0A	10212 bytes
SHA-256: `126729d75107d7fb3ba9724f96c93c48465a30962a256b8288106f7288d00613`
`font_02_sfnt_off0000e3fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3FB	16368 bytes
SHA-256: `7da53e73a348949cb631515992d5acad1848230f79bee779b5f2ef92740452e1`

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