Malicious PDF — malware analysis report

Static analysis result for SHA-256 8760061cea621cf3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 01:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dc7a41c739f545b56416f8816ebd0fc SHA-1: 9bb9a7c82e480e022bbe34df30dc4d076478b675 SHA-256: 8760061cea621cf3b505b2ab72e0fae20b07811e159f1ee126c9eed69916997d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=lost+contacts+on+android+verizon PDF link annotation
    • http://tplustech.com/images/ckeditor/files/lejukivefadozabotofu.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/66167909756.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/zositobasugatanuxemomu.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dejudozuxigitivi.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/demidom.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/35488197484.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/xurezanufobofanezok.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifodegur.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/74004340096.pdfIn PDF document text
    • http://brlairport.com/images/file/24926031677.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/57538367445.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/45183271503.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/8668325097.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/87021492203.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/migugalorifawoxutig.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/piposaze.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/totodo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/poguxesumado.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/mamefalezumeteberu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c520731889---davafatumuxob.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/jahfe5hi2gp32d5v6mrmm4u7jg/6734944295.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/kibigekavex.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/2554652575.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/84698012932.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/4626130896.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10400 bytes
SHA-256: 4a2bc379d0c3e73270b3ec2af9100fa49032fc021a7c76b14fdb915ee771cec5
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 17764 bytes
SHA-256: 49ea58b960e72c4da412c8eaa6be913e15223c6d7e3c81b261c181707aee65d2