PDF malware analysis — malicious · b50864506cf84c4f

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 03:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2f0f15004fd2937a49653a4b6fc00f64 SHA-1: 1e899ab6856c7b26e79fee88c94d3d3b5b0b8cf9 SHA-256: b50864506cf84c4feeaf5fdee51503e7edcfbc73a624655d20c10fc153c54ecc

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a tactic to distribute malware or phish credentials. The presence of embedded URLs and a 'download button' heuristic further supports this malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://irlanc.ru/uplcv?utm_term=best+moto+racing+game+for+android PDF link annotation
- https://vidaleve.net/ckfinder/userfiles/files/19848323634.pdfIn PDF document text
- http://bargiel.com.pl/ckfinder/userfiles/files/buvonemiluterebikeji.pdfIn PDF document text
- https://www.padanguparduotuve.lt/ckfinder/userfiles/files/67580187463.pdfIn PDF document text
- http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/al6v460n0h43f3q79sq28mvsq0/48883722616.pdfIn PDF document text
- http://fernandopelosini.it/userfiles/files/72648624894.pdfIn PDF document text
- http://bige.vn/uploads/userfiles/file/44461113782.pdfIn PDF document text
- https://heritagecambodiatravel.com/userfiles/file/tizibepumimofaragidide.pdfIn PDF document text
- https://arerp.kr/data/file///42887511961.pdfIn PDF document text
- https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lusanarafudero.pdfIn PDF document text
- http://wonderpanel.com/app/webroot/img/file/68671792396.pdfIn PDF document text
- https://geloracinta.com/contents/files/kedagabojogekogubopa.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/38251128ead6e1abdf24f1336ce73044/lenolinuxebotuxivef.pdfIn PDF document text
- https://giyimkent.formenemlak.com/upload/ckfinder/files/46545779525.pdfIn PDF document text
- http://sudeoksa.com/userfiles/file/20210906030515.pdfIn PDF document text
- http://primethailand.com/ckfinder/userfiles/files/jodisekikil.pdfIn PDF document text
- http://srub-servis.ru/userfiles/file/sujaferajif.pdfIn PDF document text
- http://firewheels.pe/userfiles/file/92606538908.pdfIn PDF document text
- https://unovosti.tv/ckfinder/userfiles/files/xixawoxokonurotoleki.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/9815485401.pdfIn PDF document text
- http://imosa.asia/uploads/files/202109052246208823.pdfIn PDF document text
- http://domplus.su/userfiles/files/sitejemosobovubikizod.pdfIn PDF document text
- http://administratieindex.nl/images/uploads/70494375553.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_off0000d4ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED06	10828 bytes
SHA-256: `681572f9291d0f45bd480f3556374850001b6fd93b383001a77348caa8a23625`
`font_02_sfnt_off000105cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105CD	17416 bytes
SHA-256: `e8c6c0466315bca96d5d73e3a0ca2235bf3b60c8fb6a6a97547e44a7f39773eb`

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