Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad0bbf890648a94…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 11:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89fb3d56f7af9b72d175d5dc229b8ee3 SHA-1: a568831078bfc6030db42810877d3fd21473f035 SHA-256: cad0bbf890648a9446e4c8399664a254d2d65fcca51b6dba46501db617d74e6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ppsspp+naruto+storm+4 PDF link annotation
    • http://tunesistudio.eu/userfiles/files/bamigubaf.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zipexoberi.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317215663288.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/titix.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/94786745460.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/56992611375.pdfIn PDF document text
    • http://erictex.com/ufiles/files/27842301231.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xebigamaxaniwulubam.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/litijedezuwowesofama.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902170218.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/zoridezitufiliber.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194615e916---lozuwanugefakikeba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351adad72ad---gurubenijaloxeturi.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/46272033543.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/75897139101.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/48256816919.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/52579574309.pdfIn PDF document text
    • http://sergeybazarov.ru/file/38600822917.pdfIn PDF document text
    • https://terracell.pt/images/file/mopomi.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/21513743374.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/30703066439.pdfIn PDF document text
    • https://ferropula.hr/files/fomesamokubu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/wibowuvalugopinowotulod.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zatigoditerenukipoza.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/negip.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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 16824 bytes
SHA-256: faddd01fda5b66d605530639a7bbdf7462c3b341f3a01efc32cae9bd9a0e8205
font_02_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10320 bytes
SHA-256: 179f6dfbca0475107f9121029e16b494690f611206f241d218fa8de3267ebade