Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5031fd8f382e9b8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 12:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 652a6a8636a1ad7ff33d031d575b54e7 SHA-1: f51fb6e320b9f1612ebf0daa350fa9122be68d72 SHA-256: e5031fd8f382e9b8d03b41bf1764068f6b501df75f73cbd4ae31d77bc1d49c26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the pattern of using numerous distinct, low-reputation hosts to host PDF files, likely for SEO poisoning or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=spider+man+homecoming+tamil+watch+online PDF link annotation
    • http://davcpundri.com/css/file/12728238958.pdfIn PDF document text
    • http://hongdacable.com/d/files/97357749581.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161381d69c13ac---zotowu.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/zupakexolifininiki.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/97425046119.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/feveseluvidokirela.pdfIn PDF document text
    • http://mobitransjogja.com/files/basemivawibafose.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/vajipaj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/wipemegedototef.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/miposodowumolarebebinu.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/22127037749.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1403b0c92---80870545961.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/32673621815.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/rexijafaruke.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/24432782513.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/pivefivudoliv.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vojarokekexumejopuxexa.pdfIn PDF document text
    • https://synersys.fr/contenu/file/79586139885.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/19507843929.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/50948650399.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/razipan.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/mimanulekoja.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_off0000ac9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9F 10956 bytes
SHA-256: e875785bfc79fa4dc31945cfa9a90d3e54d6e4ae554e65db604a4ced85f99491
font_01_sfnt_off0000c5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A1 15492 bytes
SHA-256: 02b178ea386222f5096cfb5b2e313c04726b57f685bf0ab6224baad85ea662e3
font_02_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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