Malicious PDF — malware analysis report

Static analysis result for SHA-256 80517921910c7f28…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 08:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b7c4f2e89cdfa9c8e626fbd633a9487 SHA-1: b029c482043245fb32bb501f35010786e57c43a8 SHA-256: 80517921910c7f2875cb489f5a909dc5c9ff3c573044cdb08cd0817385d6e905
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nichecnk.leaddeehub.com/userfiles/files/67031386707.pdf In PDF document text
    • http://2222.netsociality.com/upload/files/sopamode.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/dixil.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/99247433206.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/49932072198.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/basebubalusafopum.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44122224858.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a8870a9---fopiredolurezu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/34028492796.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/palamitiposagupovege.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/85048544341.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901121747.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/wibimejubadu.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/51886656936.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/jutitibozupox.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/vewifasekotaxonunixeviv.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/82034636200.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/5934837205.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/jixagabijojufovulegubukig.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133410742e13---87396666559.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/52715405065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=in+cold+blood+free+pdfPDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 17076 bytes
SHA-256: 1e5d2203373d1ff59f7607df9110f2dc83eca3042de2692ece285b756f65877d
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 10184 bytes
SHA-256: cde138937bc94d40cdadc484f57ea94ca74a402ce70fff8ddf1905d3b5583e70

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