PDF malware analysis — malicious · f0b7efe9455d4956

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 23:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2e6a9a16546150b6302fdff6b9573ebd SHA-1: 8e8bc3ce58162815c3ed2adc8181a7466d681da2 SHA-256: f0b7efe9455d49569460d8863293d8ac64ae8602249e1bc656b27f7b5077e0e1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://naturestuff.nl/siteimages/file/91869660417.pdf In PDF document text
- https://leise.ru/admin/ckfinder/userfiles/files/57083263998.pdfIn PDF document text
- https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/50966326757.pdfIn PDF document text
- http://ahnil.com/userData/board/file/57660626295.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/xesuwigumudanixuba.pdfIn PDF document text
- http://ural-resyrs.ru/data/file/vulax.pdfIn PDF document text
- https://www.abrasco.org.br/ckfinder/userfiles/files/nefubepeburuboj.pdfIn PDF document text
- http://ciaooo.ru/uploades/userfiles/file/58627134639.pdfIn PDF document text
- http://amandatour.ru/js/ckfinder/userfiles/files/mafipe.pdfIn PDF document text
- https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/80017991136.pdfIn PDF document text
- https://twinslock.com/locktactyuma/userfiles/file/87237087777.pdfIn PDF document text
- http://dainindo.com/Uploads/userfiles/files/pizelatusezupudi.pdfIn PDF document text
- https://altsovmun.ru/userfiles/file/bogafutumabawakopomi.pdfIn PDF document text
- https://clifestyle.net/uploades/userfiles/file/80861203738.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f32944cbb---37637381618.pdfIn PDF document text
- https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/f1fqmt1cg2ht7tqgvjb5hc2ugs/80995001872.pdfIn PDF document text
- http://konemara.hu/userfiles/file/2137373439.pdfIn PDF document text
- http://mosjob.ru/images/file/10180244936.pdfIn PDF document text
- https://dansobentre.net/uploads/file/nilavuxaxogumurodisuzopag.pdfIn PDF document text
- http://ametansk.ru/uploads2/rafiketo.pdfIn PDF document text
- http://jafra-com.at/userfiles/file/90438285686.pdfIn PDF document text
- https://ladachess.ru/userfiles/file/29201127286.pdfIn PDF document text
- http://market-oborudovanie.ru/upload/file/jutezuvim.pdfIn PDF document text
- https://creteotels.gr/FCKeditor/userimages/file/domokotegiberuzivovup.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=battlefield+game+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_off0000f311.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF311	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010b23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B23	17008 bytes
SHA-256: `afe9814ed3a7915b2c33fc7199ef0ef60e7c37663914b3eee7159008a570bc08`
`font_02_sfnt_off000136fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136FD	10580 bytes
SHA-256: `77398ee3450bdfe54c3b6bccc464aac9e1737bc5631ea686640bbf2c36e66cbf`

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