PDF malware analysis — malicious · a92a898e44364626

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 13:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0b20fef9d1cd18179efa2468afcbba9a SHA-1: 0f1be8220a1e4f6236985e19d80b1d23e3144e19 SHA-256: a92a898e44364626dbf0dbdf3e3b03214b5b68f4f65319d6bb02b1168824c0e2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, pointing to numerous external URLs, likely to obscure malicious intent or distribute further payloads. The ML classifier and ClamAV detection strongly suggest malicious activity, consistent with phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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 http://lab4050.com/upload/editor/file/wikavez.pdf In PDF document text
- http://lsbwg.com/ckfinder/userfiles/files/20210905/1226188655.pdfIn PDF document text
- http://coffee33.ru/archive/file/55473572792.pdfIn PDF document text
- https://nsck-cykelmotion.dk/ckfinder/userfiles/files/vodurumemetitopometiguwe.pdfIn PDF document text
- http://cabini.it/userfiles/files/70880084032.pdfIn PDF document text
- https://santehsevast.ru/userfiles/files/13375176355.pdfIn PDF document text
- http://sinoscaform.com/upload/ckimg/files/202109070628055016.pdfIn PDF document text
- https://transmar.biz/ckfinder/userfiles/files/zuxaluxavuse.pdfIn PDF document text
- https://openkomm.yussfone-crm.com/userfiles/file/vofapivimidu.pdfIn PDF document text
- https://matharu.ae/userfiles/file/ruzorevev.pdfIn PDF document text
- http://agrobud.net/uploaded/file/nerolajaropagu.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d275113b96f1255aef61c94757407f35/woxevudawulomodifisa.pdfIn PDF document text
- http://xn--aknmedical-yub.com/uploads/file/nitusijize.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161338a1419484---6725520330.pdfIn PDF document text
- http://studiodebiaggi.eu/userfiles/files/68979007024.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/31788682844.pdfIn PDF document text
- http://www.keizerco.nl/userFiles/file/84146869704.pdfIn PDF document text
- http://iccjsc.com/images/uploads/files/sipulurodorixukukiwax.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/viwamojixubiwowibe.pdfIn PDF document text
- http://asu78.ru/userfiles/file/28762093081.pdfIn PDF document text
- https://sharmtocairo.com/userfiles/files/vesuxozefovafosoga.pdfIn PDF document text
- http://garageanything.com/js/upload/files/wigaxonurokugawonorojiri.pdfIn PDF document text
- https://asmitahrgroup.com/ckfinder/userfiles/files/gafuwezikatiniwimulez.pdfIn PDF document text
- http://stellamaris.cz/userfiles/nezutosor.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+fortnite+free+on+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_off0000c6a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6A2	10392 bytes
SHA-256: `c9bb13af491682dc6aa77056c241372105ee379943fe4d3e12c9f1d3010fbb89`
`font_01_sfnt_off0000de14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE14	18004 bytes
SHA-256: `b2927298b1a3cb2680bf3dd3cf9bc7d717720c3ba16e96f995d3f192af983118`
`font_02_sfnt_off00010c6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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