Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefe842e903b54cf…

MALICIOUS

PDF

87.7 KB Created: 2021-09-22 14:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac47edd487538c437bc07c68c5c6a6d9 SHA-1: 366bf19666f8fd89db4ed0aab6857e5bf6479677 SHA-256: cefe842e903b54cf00f06d89edb1a176da362bb87aca276b2354972a8de201c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jr-bang.com/uploadfiles/20210902045759.pdf In PDF document text
    • http://cornwallstaffagency.com/userfiles/file/dukalobowibusotazowono.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/xapumefebalarularalezofik.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/tupozolavurelarakukoko.pdfIn PDF document text
    • https://susta.vn/userfiles/file/mezodufu.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/86206966381.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/62250431378.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/8324466207.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/11201853343.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/98765219912.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/99216613052.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/64132542182.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/71983737212.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/63764318340.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jujesimexil.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/82778750039.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/jupikubulenipexed.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141360a63521---wavoj.pdfIn PDF document text
    • https://insp.biz/img/file/wubutadetaluderona.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/86146119382.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/7053027073.pdfIn PDF document text
    • http://zuche0551.com/upload/file/93124539282.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/tuvuzexebidale.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/wesiban.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tutazikijoximi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=boot+manager+androidPDF 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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 10428 bytes
SHA-256: d001281aeefd72f8ef5c4dc7819206637fbbabf3de4341128f47ed88ed1d567f
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 17804 bytes
SHA-256: 86790f536be8ed4743a3167150793ae2f76183d8893b3e51a08f89ded60adfd2
font_02_sfnt_off000138ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1