PDF malware analysis — malicious · 17e92cb3ef5a7f98

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 07:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: a056d119f2687e633672908cf7c2e2dc SHA-1: f8cd1e38e2c43f64ca1dfd1076ea7e54c303a4af SHA-256: 17e92cb3ef5a7f98fa0c0c021bfa453329ac8f41c6c56356bc74c3564b28686c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://chcial.ru/uplcv?utm_term=demon+slayer+movie+full+mugen+train PDF link annotation
- http://tipsclubcr.com/campannas/file/28640294186.pdfIn PDF document text
- http://debandhelder.nl/ckfinder/userfiles/files/nogebipobog.pdfIn PDF document text
- https://jagamimpi.org/contents/files/95213248844.pdfIn PDF document text
- http://rent2day.ca/ci2/userfiles/files/zafugagolafunazizer.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161369e1e16588---66358631567.pdfIn PDF document text
- https://hantverksakuten.se/ckfinder/userfiles/files/91213639374.pdfIn PDF document text
- http://exosushi.com/uploads/files/77888079148.pdfIn PDF document text
- http://tingchucontrol.com/Uploadfiles/files/38948621918.pdfIn PDF document text
- https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/domorurikaze.pdfIn PDF document text
- http://kag.fr/userfiles/file/79702983885.pdfIn PDF document text
- http://werkschoenenverkoop.nl/images/docman/files/15214877345.pdfIn PDF document text
- https://nikosdimos.gr/userfiles/file/jopetotamob.pdfIn PDF document text
- http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/xabezoresutiporakekoviwaf.pdfIn PDF document text
- https://lombardpruszkow.pl/local/userfiles/file/raxubusisaripasebuxogerim.pdfIn PDF document text
- http://arqing.es/ckfinder/userfiles/files/sasil.pdfIn PDF document text
- http://awarelaxcentrum.cz/user_files/file/93159552800.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6e9b4cb0---76124681545.pdfIn PDF document text
- http://yangpupark.com/uploadfile/files/xogozuwoposirugi.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/guwex.pdfIn PDF document text
- http://leeandrewdavison.com/download/50025988686.pdfIn PDF document text
- http://whatcanidoforyou.eu/publish/file/gitejejikulilomivelax.pdfIn PDF document text
- http://pretaporter-pegah.com/userfiles/file/90002193425.pdfIn PDF document text
- http://tractortools.cz/ckfinder/userfiles/files/darirunujikabalawakoseno.pdfIn PDF document text
- http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/lorubosobefuta.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_off0000e512.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE512	22524 bytes
SHA-256: `c02fb7abdfc07f798f21cddb006d98ce061d580d9b398e3697464a460882b18d`
`font_01_sfnt_off00011fff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FFF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013816.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13816	10840 bytes
SHA-256: `a4d82fbf33fd2474477b0af9d06fe13de0b309245735a491ab0f25464dead8e4`

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