Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae0c2fcb9db6b57…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 11:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 376211af7ccd24bd9025c438d819c3de SHA-1: d2ff41b3515d7d3b495f8b73ea2dde24f0e1d883 SHA-256: eae0c2fcb9db6b57329dcc710d90113fc20102f7cd18fe22996047bd19fd6909
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites or phishing pages. The embedded JavaScript suggests an attempt to execute code, potentially for further payload delivery or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=audiobook+apps+android PDF link annotation
    • http://mintaialuminum.com/d/files/89674133588.pdfIn PDF document text
    • https://redac.ch/upload/mixetuzulexuwapajoxejinej.pdfIn PDF document text
    • http://regmac.net/userfiles/files/jozudemefofe.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161345a22b5494---91724448686.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630525762.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/83478278486.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/dojekapo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613680402b28a---3591666690.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/punawixisube.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914184347.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vizoramojifa.pdfIn PDF document text
    • http://askaudit.ru/price/gisalojiwomibavagoru.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/jemakututapatesetixux.pdfIn PDF document text
    • http://unseretochter.com/images/file/varuveliripiraxesevu.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/80253067763.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/53556334868.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/99255351755.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/vutixufozeni.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/31230866818.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/sowiv.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/pipunejok.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.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 17168 bytes
SHA-256: fc4961b18b1c5e55ba1204b092314e3acef5f99b64b5a71ca439b043dd55accc
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 10424 bytes
SHA-256: fcc1e4fa7c50904e2919ec1dd92b928815c3e473ffea4dcb7ccae03c0eb85e16

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