Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b39a7307a519e5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 03:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 824a4918421efa29077e808129b917f8 SHA-1: 32aed8a35d4f3d035e2bacd023a3919c7809bd8b SHA-256: d0b39a7307a519e507d4b7f4e7609deaa5b3488811fc010371b5fab735542396
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=searchview+in+actionbar+android+example PDF link annotation
    • http://tdvvietnam.vn/webroot/img/files/47929733016.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/8550413196.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/5205471958.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xalaxunudutitopanujujetam.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/82212619964.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-3/20210903055555721963.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/tamadivisuxixupol.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zigedamiwivulow.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/7640800902.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/xetigixanowamobi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/funazujakelejekoxuvipot.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/nuziv.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/44507962921.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/75379955899.pdfIn PDF document text
    • http://regcureguide.com/files/files/bekamomovixuvi.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/vilidumorin.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/medabugetu.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/15464213221.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109052033168136.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/69763119622.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/38709820075.pdfIn PDF document text
    • http://dobermanncz.eu/files/31555901537.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/11596123889.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/1188602081.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/65267871470.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5acfb918667aa6a0904d3923dd26178a/78093795532.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/40301683210.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/93622901200.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://www.apache.org/licensss/license-2.0In 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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 11080 bytes
SHA-256: 88419f33ad58c6d4c9ec87a174a00d1990d89e624248828de2d7afd54e06680d
font_02_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 16752 bytes
SHA-256: d4e7124fbf40ee90b779e540bfb24f9960eef3f48b3ad7b0aec5066c29d665fa