Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead21eb7d35387bf…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 00:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 298c586452a07a87105a3361e59e3828 SHA-1: 2a58b872b64e2fb2b80930eaee7d1d71a0fda00c SHA-256: ead21eb7d35387bf30f68cc809ace12b2e3891914bb24d266664120da03c064f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF with numerous external URIs pointing to potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags it as a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimirexiwezov.pdf In PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/papadovikasujozewuma.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/kudatitonaworeno.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/27149372939.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/nenuporidasutanejomazamax.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/geziluwefuwif.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/38556159285.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zuliwowatinudaz.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/34338282876.pdfIn PDF document text
    • http://sparkpro.lv/content/file/lefogemulame.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/70469441202.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/44854610968.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312c53d60b8---53443993654.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/70068824022.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109060616567209.pdfIn PDF document text
    • http://hoachattn.com/image/files/40368329142.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/12663652207.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/jitetiretipomolobezi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/mulalobal.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/96001453440.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210911051054.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/62720697857.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_09317E1C3EFDB6A8.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/46762149212.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5ed47274---64748616565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=walking+dead+season+11+online+freePDF 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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 10568 bytes
SHA-256: 4bafe0ce9222b203b837e741650784f9266695b8113cb4994fe1aa03ccf7aa85
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 18488 bytes
SHA-256: 2f1cec851a8f0b0e422f95483b41f405268f4e5b37fbf4d7e8d53c875ec1f147
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1