PDF malware analysis — malicious · f327753ced380880

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 21:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: ccfce955f9c7d2117438237a5884f9f0 SHA-1: fcf82ede5dde575c4d6d511c00c94d95557b34a3 SHA-256: f327753ced3808802447da2daa77aa1b09d445ecd647b31824818402c41c99f6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users. One such URI, https://chcial.ru/uplcv?utm_term=download+game+island+king, indicates a lure related to downloading a game. The presence of embedded JavaScript further supports malicious intent, likely for exploitation or payload delivery.

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=download+game+island+king PDF link annotation
- http://nmways.com/uploads/fckupload/file/84042527015.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/33474091366.pdfIn PDF document text
- http://hglobaltour.com/FileData/ckfinder/files/20210915_EA4758459FCA21E4.pdfIn PDF document text
- http://kfnmdg.com/upfolder/e/files/20210906165324.pdfIn PDF document text
- http://sky1981.com/asset/uploads/files/davobun.pdfIn PDF document text
- http://mevlanaasm.com/resimler/files/karoduvutipaju.pdfIn PDF document text
- https://nangluongvada.com/uploads/files/62099440645.pdfIn PDF document text
- http://chandravanshi.com/userfiles/file/2202696421.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/nelazodupefirigugo.pdfIn PDF document text
- https://un7un9b3rl1pa7-99.com/contents/files/78364658691.pdfIn PDF document text
- http://yhbinternational.com/userfiles/file/nupupidusog.pdfIn PDF document text
- http://chochosanencino.com/uploads/files/33996252225.pdfIn PDF document text
- http://geologicatoscana.eu/userfiles/files/70544464498.pdfIn PDF document text
- https://afma.pt/site/upload/file/91765596388.pdfIn PDF document text
- http://plafondchauffant.fr/img/user/file/tizewitafagamafug.pdfIn PDF document text
- http://avsa.org/sites/default/files/images/files/luzifepid.pdfIn PDF document text
- http://fantacyhandicraft.com/userfiles/file/wimixuwobobedo.pdfIn PDF document text
- http://ideatity.com/ckfinder/userfiles/files/65552298041.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/35107843742.pdfIn PDF document text
- https://jucariicopilasi.ro/app/webroot/files/userfiles/files/83975280712.pdfIn PDF document text
- https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2cba1e3969bfae0d270ef72f71f79d62/8927179281.pdfIn PDF document text
- https://robodom.si/files_vsebine/78471286016.pdfIn PDF document text
- http://hotspot-usa.com/js/upload/files/biboxeguzo.pdfIn PDF document text
- http://residencelesaline.it/userfiles/files/mifafenujunimaravuko.pdfIn PDF document text
- http://rydelko.pl/userfiles/file/beliwariw.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_off0000b599.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB599	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cdb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDB0	10572 bytes
SHA-256: `18cdaa485b861782aacfb8f7656dc87e2e9f617c46b334a12159f4edb4aa2b20`
`font_02_sfnt_off0000e595.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE595	15660 bytes
SHA-256: `016f8e2f159d2d7cca8242ef8045e16310945a41ae7b112116f9950ef2685ff5`

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