PDF malware analysis — malicious · 50a6bc711b2b4d34

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 20:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 75d0a7d30b6bb00db0a43bafd6c0483d SHA-1: ad9601499a73a3e8c7d2312da2c757a7e902fa5e SHA-256: 50a6bc711b2b4d34419d78cef5a29de13cf9b1ea4aed2d967cd07f7703b38cf1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links pointing to various domains, many of which are likely disposable, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 5

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.
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://kbautotech.com/board/datafiles/imagefile/vebaziwolamexatukozewo.pdf In PDF document text
- https://icrs-as.com/userfiles/file/fadozexiwegowunula.pdfIn PDF document text
- http://sanfrancescovet.com/userfiles/files/gasipolavena.pdfIn PDF document text
- http://modero.vn/upload/files/vapatos.pdfIn PDF document text
- http://isagenixmakessense.com/ckfinder/userfiles/files/dujokamewonabe.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/87796807632.pdfIn PDF document text
- http://sbkf.org/files/files/wudadijegizukudur.pdfIn PDF document text
- http://nicolalazzarotto.com/userfiles/files/puxuxor.pdfIn PDF document text
- http://broadviewlibrary.org/uploaded_bvlib/file/38991113157.pdfIn PDF document text
- https://mvmdigital.gr/files/files/paxujar.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/sofipisarifimaxusizevaman.pdfIn PDF document text
- http://forumts.com/ckfinder/userfiles/files/30291772631.pdfIn PDF document text
- http://pp-aqua.com/userfiles/files/daburiva.pdfIn PDF document text
- https://cgeminfos.ma/upload/file/riwobetamip.pdfIn PDF document text
- http://chongqinghaohong.com/upload/files/88902095772.pdfIn PDF document text
- http://koszyczarek.pl/userfiles/file/punara.pdfIn PDF document text
- http://bora.su/ckfinder/userfiles/files/28675038125.pdfIn PDF document text
- https://jagamimpi.com/contents/files/54878685796.pdfIn PDF document text
- http://tubelessons.net/cms_images/file/wipem.pdfIn PDF document text
- http://yonezawanet.jp/units/24250/zcycom/files/zapitemulumerusazu.pdfIn PDF document text
- http://woodbridgeabw.com/uploads/files/86195934389.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f8f051a---siwebozefegawibatibaneji.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/juwalufaxavisaxejil.pdfIn PDF document text
- http://cathugo.de/res/wysiwyg/file/44442388148.pdfIn PDF document text
- https://fa-vietnam.com/webroot/img/files/69880070625.pdfIn PDF document text
- https://jechrina.gr/FCKeditor/userimages/file/62277888950.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+ghost+hunting+apps+for+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_off0000ce31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE31	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e643.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE643	18048 bytes
SHA-256: `33c980343ef528b56df7d517c60a8ba20990afeb3960053f7ed5ce9a9aa158f7`
`font_02_sfnt_off00011450.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11450	10884 bytes
SHA-256: `b1c90549bc7f4aa90c26e703093c9a21ddd38af29d7560dee4822edc1c76bcc9`

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