PDF malware analysis — malicious · 381fce9aa8a578c5

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 10:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a059b3b8c9ef5fb0e49925e865f3600a SHA-1: 35cbe6e1dd689a6d321ef514c0392cd9434b6675 SHA-256: 381fce9aa8a578c572d6b8f936234cd89978d9ba856c615f18864672374b3d20

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, and the ML classifier strongly flags it as malicious. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://aviapartner.biz/js/ckfinder/userfiles/files/17893918405.pdf In PDF document text
- http://weilandensemble.nl/ckfinder/userfiles/files/20969808906.pdfIn PDF document text
- http://savoie-outils-coupants.com/ckfinder/userfiles/files/85020350395.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4ob14t1iqdd92cafi8760v5j14/27227544491.pdfIn PDF document text
- http://mengnuanua.com/app/webroot/files/files/tetodupatajorazibep.pdfIn PDF document text
- http://theexplorerthai.com/userfiles/files/96531229968.pdfIn PDF document text
- http://eptesteplelek.com/uploads/file/rapavufaloduxagakenatigon.pdfIn PDF document text
- https://mahanakhon.pacedev.com/ckupload/files/pipupazig.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613400d40e488---36569002602.pdfIn PDF document text
- http://collectifff.be/imgdb/accueil/files/xovuribavedisoxoz.pdfIn PDF document text
- http://sakra.sk/storage/file/3401991002.pdfIn PDF document text
- https://noithatkuongthinh.com/uploads/files/83752189303.pdfIn PDF document text
- https://lean-ds.com/upload/editor/file/faritamifozamomujobiro.pdfIn PDF document text
- https://weborder.cloud/userfiles/file///84666659159.pdfIn PDF document text
- http://tksvolga.ru/userfiles/file/nexuzik.pdfIn PDF document text
- http://tt-ural.su/admin/ckfinder/userfiles/files/70920014792.pdfIn PDF document text
- https://www.mds-horizons.com/upload/files/pamaziraxewig.pdfIn PDF document text
- http://pasaru.com/upload/files/zojijorefar.pdfIn PDF document text
- http://wmc21.com/ckupload/files/43244018069.pdfIn PDF document text
- http://dentalweek.eu/userfiles/files/80102018100.pdfIn PDF document text
- http://dydlhx.com/upfiles/file///rarujowufiwatezolabekalu.pdfIn PDF document text
- https://anukulagrotech.com/ci/userfiles/files/gewin.pdfIn PDF document text
- http://dglytbt.com/upfolder/e/files/20210905020037.pdfIn PDF document text
- https://adtw1.elfjane.com/ckfinder/userfiles/files/figoranobanomofuxat.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=steam+link+androidPDF 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_off0000dea9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEA9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f6c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C0	10408 bytes
SHA-256: `d17293629e3b090e6d570107f76bc0a3e866fb8d3c437eb4984e0237a4e70e39`
`font_02_sfnt_off00010e3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E3C	17544 bytes
SHA-256: `7cb4380481f5f122e70920e23627825445562f715f4363f5c93025274099bdf3`

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