PDF malware analysis — malicious · 8b1a96ddee8e7488

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 4ce7c82f112b075793bb7f91394fff4f SHA-1: dff22af195064424eb8b82102ddf61d4bd31b8c5 SHA-256: 8b1a96ddee8e74882f31097213949e218002e5344252b6b8efe99950f8a6264e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, indicating an attempt to execute malicious code. The numerous external URIs, many pointing to PDF files on potentially disposable domains, suggest a link farm or redirection mechanism designed to lead users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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.
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://xn--lenachatka-57b.pl/uploaded/file/91408030164.pdf In PDF document text
- http://denkobarbell.com/_upload/files/92814437918.pdfIn PDF document text
- http://bhhangkhong.com/upload/images/files/rupatogawegoximitub.pdfIn PDF document text
- http://elencostruzioni.it/userfiles/files/69260036588.pdfIn PDF document text
- http://sk4education.com/ckfinder/userfiles/files/95366479579.pdfIn PDF document text
- http://stroi-sistema.ru/img/jilubujo.pdfIn PDF document text
- http://www.specemc.ru/upload/files/pesalifudaretezu.pdfIn PDF document text
- https://elemental-ia.com/userfiles/file/67706843618.pdfIn PDF document text
- https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/vixinadeligup.pdfIn PDF document text
- https://thefertilizergranulator.com/d/files/bovolubebafe.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a78b27143---48801266194.pdfIn PDF document text
- https://oncetrabzon.com/resimler/files/20932789411.pdfIn PDF document text
- http://imoroz.by/upload/file/guzekowidanetiketu.pdfIn PDF document text
- http://defhjdr.friend-match.com/upload/files/ramebilolawuxoxetupad.pdfIn PDF document text
- https://cowik.pl/upload/wusawo.pdfIn PDF document text
- http://abbeytraining.net/userfiles/file/15013801826.pdfIn PDF document text
- http://thaihotelsale.com/FileData/ckfinder/files/20210911_386C6E11D01E8146.pdfIn PDF document text
- http://xsjsbzrw.com/uploads/files/dujewegusiduwufivumejo.pdfIn PDF document text
- http://canphantich.net/Images_upload/files/73420087860.pdfIn PDF document text
- http://crosswaysrecruitment.com/userfiles/file/lovivafusavazixijivutowos.pdfIn PDF document text
- https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/83989257565.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/xeguj.pdfIn PDF document text
- http://kronikarp.pl/ckfinder/userfiles/files/supitejuzebojir.pdfIn PDF document text
- http://elistaprezentow.pl/userfiles/file/33951554184.pdfIn PDF document text
- https://granitnet.hu/editor_up/xorebob.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=netrunner+2017+world+championship+deckPDF 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_off0000ccbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCBC	11380 bytes
SHA-256: `284bb100f172134f228758bbcc72358fca98a736aee8b5945eee68190e136a24`
`font_01_sfnt_off0000e789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE789	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9B	17160 bytes
SHA-256: `590f33790dffaae9c5828a60ee066dd5d4db393f230f0f5a4f379493c215c67e`

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