Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeda4b0fb1d105d7…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 02:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5397ebfb38a724cf2f6781885b44506 SHA-1: 031919e1307dab63ad495038c5ac2440148f1ed9 SHA-256: aeda4b0fb1d105d7a85b1b3b4018b4580d54c48bb8744167678cb7cc25beea32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or redirection scheme. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b9avft3u7v9hakjno4d28e5apa/7938763757.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/dewuvizevafabowefolanodem.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/marufado.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xexabobiwafojunixibewawe.pdfIn PDF document text
    • https://marosme.ro/hirek/file/41690575971.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/tiwerirovidenovaken.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65db63150---lasivinererozedimixazeko.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wagurerepimiluz.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/80292166220.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/jevibilusugavivitivizoto.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/vedukenivavigili.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/nilozoradinaxe.pdfIn PDF document text
    • https://digireg.si/upload/rafapew.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/9265404481.pdfIn PDF document text
    • https://paperland.bg/uploads/file/50818435093.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/99966377446.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/76770651295.pdfIn PDF document text
    • https://eventaipei.com/upload/files/jidifitete.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/3898847911.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/lewabebezuzotolejaruzap.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/72959222064.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/99529025440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=check+battery+life+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.

FilenameKindSourceSize
font_00_sfnt_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 10784 bytes
SHA-256: 75c23774e15ace0393fb219e7d2a7d1e2250c58ec2c689e5d12710085deaab61
font_01_sfnt_off0000c842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC842 15448 bytes
SHA-256: 731f0a9fa45da8e82a99a8dab782f0f9f1e2fb94e16b70403537c9fe7d94014a
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1