PDF malware analysis — malicious · d21ae91eeb23b1be

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 16:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 36481d072c4c52fffcae68296c4ff9f2 SHA-1: 9079acae63e4f0c6067791db896f3a00fcf966f9 SHA-256: d21ae91eeb23b1be78c4fd2218ea423baf45e93b2a7c7aa095116ae45cf5afdd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
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://albertoangel.sinecsas.com/ckfinder/userfiles/files/risajali.pdf In PDF document text
- https://frigosztufi.ro/ckfinder/userfiles/files/salolabebazotepezower.pdfIn PDF document text
- http://cmcthailand.com/ckfinder/userfiles/files/12030542501.pdfIn PDF document text
- http://roycraft.ca/userfiles/file/40990415374.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/13775631144.pdfIn PDF document text
- https://sofanet.ro/ckfinder/userfiles/files/40397173155.pdfIn PDF document text
- https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/54314120335.pdfIn PDF document text
- https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/75434415206.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/98468714074.pdfIn PDF document text
- http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xekiguzifuxurulexopad.pdfIn PDF document text
- http://playonathletics.com/userfiles/file/nexokukatariwel.pdfIn PDF document text
- http://magnumprint.ru/upload/files/7773937558.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fe9a4ef9cb63f8763a3c967c9e3fbc1d/38418683191.pdfIn PDF document text
- http://gianniarnaudo.com/userfiles/files/ditijadurumal.pdfIn PDF document text
- https://ht-cooling-j3t.com/contents/files/zedabefezulixag.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce3822dfc---95749166980.pdfIn PDF document text
- https://familienbilstrup.dk/ckfinder/userfiles/files/tuxenomesoxipibafoneti.pdfIn PDF document text
- https://www.medicalbi.com/ckfinder/userfiles/files/kutisar.pdfIn PDF document text
- http://rioairporttransfer.com/ckfinder/userfiles/files/worizexigipaw.pdfIn PDF document text
- http://vinabomi.com/uploads/userfiles/file/54887436113.pdfIn PDF document text
- https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/87898253024.pdfIn PDF document text
- https://kawanmto.info/contents/files/80001403667.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+bookmark+on+android+phonePDF 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_off0000e8d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000100f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100F0	10752 bytes
SHA-256: `262eaf1ba14cfa367f1b6007e311ff34d550969dc180a90aef1fc4d1864e914b`
`font_02_sfnt_off00011938.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11938	17620 bytes
SHA-256: `1ef4464d9825edfb495c76f718b8db66acf778095ffad7917038bc8e6dd32397`

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