PDF malware analysis — malicious · ca9fa46bb5d6bba4

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 10:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 58141e73bdf9041c6f14426f18a58d19 SHA-1: b03f30649e2bf22f9e0dc1ac385d6051af80f644 SHA-256: ca9fa46bb5d6bba41df59180f8bc3d0295fac1c95b357565c806f16033668280

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ClamAV detection and ML classifier further support its malicious nature.

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 https://krisoc.ru/uplcv?utm_term=board+kings+mod PDF link annotation
- https://www.rapn.ru/ckfinder/userfiles/files/44728750374.pdfIn PDF document text
- https://preciseenergygroup.com/media/donuzanonomupamag.pdfIn PDF document text
- http://podolsk-kondicionery.ru/upload_picture/file/88762574390.pdfIn PDF document text
- https://chataigne-cevennes.fr/imgs/files/kijaremexiwawaduxelav.pdfIn PDF document text
- http://szmchem.com/userfiles/file/1661034884.pdfIn PDF document text
- https://nakipoglugroup.com/upload/ckfinder/files/nafoparobu.pdfIn PDF document text
- http://circolosilverblufitnessclub.eu/userfiles/files/69253332845.pdfIn PDF document text
- http://strelnicebudejovice.cz/userfiles/file/89611976219.pdfIn PDF document text
- https://www.edmcenter.xyz/ckfinder/userfiles/files/40504462014.pdfIn PDF document text
- http://tavio.su/files/file/diluloxusopibumalugur.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bc1ed052---32533307790.pdfIn PDF document text
- http://toyotaprius-custom.com/js/upload/files/64811236185.pdfIn PDF document text
- http://svazekobciorlice.cz/userfiles/file/85746509370.pdfIn PDF document text
- http://castrolmintabolt.hu/images/upload/file/fifedumakofef.pdfIn PDF document text
- https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/bogabimuxubimapuwazak.pdfIn PDF document text
- http://ilonew.tasksplan.com/ckfinder/userfiles/files/26351251842.pdfIn PDF document text
- https://tourpon.kr/FileData/ckfinder/files/20210906_B5BC425375BE1DB0.pdfIn PDF document text
- http://www.plan.msu.ac.th/ckfinder/userfiles/files/56202564130.pdfIn PDF document text
- https://mtydizayn.com/userfiles/file/pijunoluf.pdfIn PDF document text
- http://burattinojatek.hu/userfiles/file/15168025118.pdfIn PDF document text
- http://tootingtaxi.com/survey/userfiles/files/vimupile.pdfIn PDF document text
- https://garraldaarquitectura.com/garralda_userfiles/files/54260209040.pdfIn PDF document text
- https://zaragozadenoche.es/upload/files/nurox.pdfIn PDF document text
- https://kovtec.pl/eurostyl/photos/file/15153367052.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_off0000d976.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD976	17512 bytes
SHA-256: `550bcf3575ba99298d870838b590e96e6de409a3d6bdd3dce3807189ac6b9359`
`font_01_sfnt_off000106c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106C6	10460 bytes
SHA-256: `cd077878aab2f21f6322ca239da208c8a878e095c4e208fc703a999a5b6d22cc`
`font_02_sfnt_off00011e43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E43	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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