Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7f36cd3eb50d6d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 11:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d6abdf67e7b6a46002d0df20577eef2 SHA-1: bb0c82442e01776d5c2510bd149ebdd2ff806763 SHA-256: dd7f36cd3eb50d6de3b0ade749525545ac8ce9a38a3cf3cbb4d9620615a29438
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on suspicious domains, indicating a phishing or redirection attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting the PDF is designed to host many links on disposable domains. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fitviewer.info/files/file/suwerakemeka.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b69bf432---dobukiwobapatikug.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/robubufaran.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/69218919471.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/3071341852.pdfIn PDF document text
    • http://chapelguild.com/images/usr/zobonotujone.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/bogotujeki.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210907_215506_170.pdfIn PDF document text
    • https://termofriz.rs/files/74756174219.pdfIn PDF document text
    • http://generoussecurity.com/uploads/susizebefalakutoj.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc80f1fc0---56838453159.pdfIn PDF document text
    • http://didopack.com/files/pobupetage.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/sukegijowewafosofipobis.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/41044420580.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/foditiba.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/gapuwinav.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/zidedunezokozuf.pdfIn PDF document text
    • http://ailizia.com/userfiles/86138329312.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/savevovazojonemuxa.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/35523988104.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sivetejiberaz.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/losezabiperugopawozal.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18041210b---48925909023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=trigonometric+proof+calculatorPDF 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_off0000b14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 15220 bytes
SHA-256: 7306a03bbae41ad6f1d2e34eef048b36910203dc1c04bc8201992baeb8451d6d
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10716 bytes
SHA-256: d8f0f0abe2c72a701c1e097ff7c2a234418431241cc5f8a8227aff5ea03b743a
font_02_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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