Malicious PDF — malware analysis report

Static analysis result for SHA-256 19177276d505ad6e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 10:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ec40ad448a3f13a826b0b859838d9a09 SHA-1: b86baddbf603462a434e34721c70eaf049fb7360 SHA-256: 19177276d505ad6e2de5596f212dbc5357c60ca1a41baee460dffd317ff1f7b0
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dunakeszi.varosom.hu/userfiles/files/98389233450.pdf In PDF document text
    • https://seerupit.dk/assens/file/81650156860.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/witebijegajeme.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gisasajovef.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/gopigarejubigin.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/22477987992.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/julosukufefaliv.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/19199385397.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/30208685761.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/851708403.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/73817009553.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lerisexumuzopegabajijas.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/gawajutazakotomemozapiv.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/dovikutegusitimivuneg.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/61716281952.pdfIn PDF document text
    • https://remini.hu/userfiles/file/wevadosokifiru.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041641369692.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18095908399.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/92406129543.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/91296753453.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/68451866845.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630623924.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/bifete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pixel+car+racing+unlimited+moneyPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 18140 bytes
SHA-256: a4706e8b1d2d320f7ea2aa6917baeaf79e9ec24233ef01245f87be5e98e0a48d
font_01_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 10864 bytes
SHA-256: 67061037298794f30e119c0ad790ca22110783f7f8bae479df60c0deedcbd9e1

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