PDF malware analysis — malicious · 8b642fb3acf703d3

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 07:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: cce2f689e881d3c630db1d9d5d6f3fb6 SHA-1: 0f9d3a978affbdc6a833723584bfdf588b3fc18f SHA-256: 8b642fb3acf703d3e147a47ff8020e0a1bb2b567c09de6439e6b7c6d6f170c7d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document points to numerous other PDFs hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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://goldnumber.info/userfiles/file/68043058629.pdf In PDF document text
- https://bititechnika.com/uploads/file/28490297928.pdfIn PDF document text
- http://crystaltrade.hu/data/file/rasajazizutogebox.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/tesovi.pdfIn PDF document text
- https://phatgiaolongan.com/upload/ckupload/files/wawudazatezuragiluxi.pdfIn PDF document text
- https://childprotectionindia.com/lexcyberia/userfiles/files/58387770500.pdfIn PDF document text
- http://t-p-fortune.com/userfiles/file/89448927989.pdfIn PDF document text
- http://krupongs.com/images/file/43581522435.pdfIn PDF document text
- http://bhk-aindling.com/userfiles/files/89696146700.pdfIn PDF document text
- https://bistakalikotenetwork.com/userfiles/file/jubovoxiweta.pdfIn PDF document text
- https://yenicekentkaplicasi.com/userfiles/file/vawarifotamir.pdfIn PDF document text
- https://christianklein.eu/Quansis/ckfinder/userfiles/files/54462821120.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/76260116961.pdfIn PDF document text
- http://www.horakgolf.cz/ckfinder/userfiles/files/21726757224.pdfIn PDF document text
- http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130179890fe4---32667801577.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/dakevupoboxa.pdfIn PDF document text
- https://agentcctv.com/userfiles/file/gawinimasovegisuxalosujaz.pdfIn PDF document text
- http://noclegsosnowiec.pl/eurostyl/photos/file/sumiruvopumomubasore.pdfIn PDF document text
- https://kaparatt.com/images/File/67515826510.pdfIn PDF document text
- http://royalwedding.jp/images/blog/file/bolaz.pdfIn PDF document text
- http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/62300011330.pdfIn PDF document text
- https://brillimet.com/uploads/files/202109050751505682.pdfIn PDF document text
- https://hatinhjobs.com/upload/files/figijijibogo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=escapist+2+apk+freePDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000afa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAFA3	10400 bytes
SHA-256: `85ed60b81ebd228cf1b9aa212053ffa0faebb3083ca7d836488c1304476fe217`
`font_01_sfnt_off0000c76d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC76D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000df7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF7F	18564 bytes
SHA-256: `4e8245b40e6c18e5487cc3219f31147424c86c9016ddd6c9d3a1475fa9453103`
`font_03_sfnt_off00010e2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E2F	16232 bytes
SHA-256: `01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684`

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