PDF malware analysis — malicious · a181bfd710b3f0b0

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: df649b779634a22fd0434351a363ab78 SHA-1: 5f915f0007a916e73b626a3235e326e50075eee6 SHA-256: a181bfd710b3f0b0b6c176f878f11c1cf96a8da5200b6546a24f127e8491c1d9

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the PDF acts as a link farm on disposable hosting, pointing to numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the embedded JavaScript and external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=lessons+learned+in+software+testing PDF link annotation
- https://imad0c0.com/js/ckfinder/userfiles/files/1976589210.pdfIn PDF document text
- http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/29935629932.pdfIn PDF document text
- http://fanghsin.com/uploads/files/202109110004532228.pdfIn PDF document text
- http://naszemotyle.natura2000.pl/imgturysta/files/2785428358.pdfIn PDF document text
- http://wwm-quanta.com/upload/files/davadasexoru.pdfIn PDF document text
- http://kool-house.com/upload/editor/file/72996989816.pdfIn PDF document text
- http://www.cenlafilm.com/siteuploads/editorimg/file/16065637726.pdfIn PDF document text
- http://meghdoothsuzuki.com/uploads/60672791063.pdfIn PDF document text
- https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/jelebevowawer.pdfIn PDF document text
- https://yuanfuconstruction.com/ckfinder/upload/files/65217037701.pdfIn PDF document text
- http://zzfcw.com/file/fkimg/file/86635758637.pdfIn PDF document text
- https://ecableapp.com/FCKeditor/FCKimgUpload/file/73029444738.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/53899341854.pdfIn PDF document text
- http://cuboni.com/uploadfile/hong202109070105016458.pdfIn PDF document text
- http://dolaninsurancetx.com/customcms/uploads/files/fudobomawu.pdfIn PDF document text
- https://nicklason.se/ckfinder/userfiles/files/bekatosivamazetede.pdfIn PDF document text
- http://kossuthdigisuli.hu/userfiles/file/22189215227.pdfIn PDF document text
- http://derivat.sk/files/82951040823.pdfIn PDF document text
- https://odlingfamily.com/userfiles/file/88234096710.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/53177389079.pdfIn PDF document text
- http://koutingchina.com/upload/files/xovugojifakumamulakewa.pdfIn PDF document text
- https://ehbo-oostkapelle.nl/userfiles/file/47474032922.pdfIn PDF document text
- http://s250801404.onlinehome.fr/img/uploaded/file/maxexawizewebit.pdfIn PDF document text
- 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_off0000b65f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB65F	18472 bytes
SHA-256: `1151c6e8d553ba9da1a4f012afc3bc0d10b64ec308274d69ea0802091785f5ec`
`font_01_sfnt_off0000e570.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE570	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fd87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD87	10572 bytes
SHA-256: `be21eb38f644792851d18ff49d15feb90a059ea8adf697f13668c496b7ad89dc`

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