PDF malware analysis — malicious · fd2f770748bbc35c

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 13:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a5e965727cad7725f621f3960eb7c742 SHA-1: f934dc2b6bfdd12edce4f8fa0059cecbcde4e9df SHA-256: fd2f770748bbc35c4595d57758ec74c5c1fa016994e19e10618426c871521542

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. The presence of embedded JavaScript and numerous external URIs, many on suspicious domains, strongly suggests a phishing or redirection scheme. The primary goal appears to be directing users to potentially malicious websites through a large number of links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=best+platform+for+online+classroom PDF link annotation
- https://eventpro-kontraktorpameran.com/uploaded/files/77662316833.pdfIn PDF document text
- http://cameranichietsu.com/luutru/files/53210745052.pdfIn PDF document text
- http://opusincertum.it/userfiles/files/nalidovaxuridizabagafabi.pdfIn PDF document text
- http://giadinhmedia.com/uploads/files/2133950973.pdfIn PDF document text
- http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/92806601460.pdfIn PDF document text
- https://heyratacademy.ir/file/82095017887.pdfIn PDF document text
- https://nocnepal.org.np/ckfinder/userfiles/files/jawitijomotazuvonobi.pdfIn PDF document text
- http://amsasecretariat.fr/userfiles/file/39087649596.pdfIn PDF document text
- http://stroyindustry.com/userfiles/file/lilibut.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cad2273c---muzubabexeti.pdfIn PDF document text
- http://fruitsad.pl/images/file/zufigigonadorogitiwupi.pdfIn PDF document text
- http://ladispensadicampagna.it/uploads/assets/file/kevasawasurafobugesijit.pdfIn PDF document text
- http://kaitianjinghua.cn/admin/userfiles/file/202109162320466218.pdfIn PDF document text
- http://sirindhorn.net/upload/File/39111069063.pdfIn PDF document text
- https://mediaget.ru/userfiles/files/wonon.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b959e44be4---bolazomowu.pdfIn PDF document text
- http://allineers.morefriendship.com/upload/files/88207139077.pdfIn PDF document text
- http://scpt.it/userfiles/files/99548321562.pdfIn PDF document text
- http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/27608295308.pdfIn PDF document text
- https://latgalesamatnieki.lv/files/file/31018877168.pdfIn PDF document text
- http://studiotecnicomaglio.it/userfiles/files/xipetakufa.pdfIn PDF document text
- https://alternativecarrepair.nl/userfiles/file/rerufilijudiret.pdfIn PDF document text
- https://almuhja.ps/ckfinder/userfiles/files/patasovuw.pdfIn PDF document text
- http://assotechne.eu/userfiles/files/55737620175.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_off0000dca8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4BF	10696 bytes
SHA-256: `3093279d269244ee679c6f3191dcc2f87eee3642a9c74c7d742993c18248b519`
`font_02_sfnt_off00010d4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D4C	16676 bytes
SHA-256: `8f24508cd2276490c96fdaf5c20b5e450a1d9aefc4ad0785b7e7bc6d8184239a`

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