Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad39ab8dcdb77028…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 20:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6048041e165fecec679b2a724cc2f7d1 SHA-1: e6929e43f17adfcfd533bf22ab99c74b857c507a SHA-256: ad39ab8dcdb770280a59a37db75f7186bcfd3aee0def84682b608c636557b774
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document body likely contains a large number of links, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 https://dcicz.org/userfiles/file/kiboli.pdf In PDF document text
    • https://mmtours.si/uploads/xosilifo.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/9735664851.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/34384366006.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/38807795790.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ritos.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/polavogusozuxetububi.pdfIn PDF document text
    • http://zae.me/datafiles/file/73913552681.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/vinazukujowoxaluru.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • https://profm.hu/files/file/fatowaxo.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/jaxudizadunetidena.pdfIn PDF document text
    • http://livestocktool.com/d/files/tuwoxajanulizevotibu.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/6174352785.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/28723863067.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/velavewalovol.pdfIn PDF document text
    • https://autoskola-scp.com/files/89966220705.pdfIn PDF document text
    • https://tpk-m.ru/files/file/zufudesodudowalaleginato.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/77606920540.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109121838449105.pdfIn PDF document text
    • http://bulmarconsult.com/files/sopizokexurujizavukoxotiw.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/185867986961450cb6a2ed0.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufizux.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/mivajulopazasarasomi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613123506bcd9---16381691613.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/58898042780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sonic+final+fantasy+1PDF 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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 18456 bytes
SHA-256: f5cb4ad0fc74511739f7995f4bd57c3a481eaeaf51c96cdcbd5725b3b0fca6ef
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 10340 bytes
SHA-256: 0549dddd4c5f9a9ce0518a87c4e0242d73093ed1104d554c2261678f96ba9765
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1