Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe48e0fe422b65a0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 05:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a14ddfcd4f7290d237e6c68d08547dc2 SHA-1: 43a3e1b90f1fae003e6347af7dd866c55589d841 SHA-256: fe48e0fe422b65a01eec19ba2348b79485ef36b4b81fe3c4953522ae864decfb
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=asi+se+dice+level+2+workbook+answer+key+pdf PDF link annotation
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/xapabuxur.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/50173612929.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dadc0beb8---lisurakanu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/wafivirunej.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/46006375095.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/19926730634.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/43905461210.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/4042538447.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/86025064711.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/50338432444.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/31361340862.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/57800982111.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/54361939598.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/5613153735.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/7670611329.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6779901577.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901232958.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/38178637890.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rutikaforururumuxov.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/mofidevadisuxikusa.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/78897724961.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vitalidabebodulogol.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/wigidumewujadag.pdfIn PDF document text
    • http://medrea.ru/upload/files/wewikisavevuripipozurodi.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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 11112 bytes
SHA-256: 6870a89097d480771421ed0cab17b9b291da5ca6fbf27d25c24215ca6516839f
font_02_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 17132 bytes
SHA-256: cb00a1c1c76f9c0c27949fad8774dded8bc189351353619e487effdea8592193