Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d8b3e132524328…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 09:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ff46d0e9044d28cde31c88ecc2d2222 SHA-1: 001990d639e38819fecd9b30ac59204d6c95259e SHA-256: 19d8b3e13252432831ea7bd96e6f67fbf3d89029655e7cca531608f7725ae1b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute or redirect to malicious content. The presence of external URIs and the nature of the heuristics strongly suggest this document is used as a lure to trick users into visiting malicious websites or downloading further malware, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cructi.ru/uplcv?utm_term=download+ben+10+protector+of+earth+for+android+ppsspp PDF link annotation
    • http://printific.com/images/contentimages/files/90257363944.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vukaborugezozejetamodor.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/xukofavivuk.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/jalipisinijamevajewegixa.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/87969649874.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/14255692761.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/45160301557.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/jixibugodofinakasejaromez.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/m84e938tkf8hb3o5u93bh03td5/bevulibuwapu.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/sumemejomako.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nuzajifonopidunixovonuw.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/vosirulas.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jejipunifudubekoromojet.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a7c29c7---fesopubarusonu.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/30819114983.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/60490409199.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/nedepumagefav.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210901171349.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/novakabopubir.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/risesidolu.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/bidofofi.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/rotufezomiroma.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/77664721001.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/14318554055.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/56355912930.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xagoluxepix.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/7188510311.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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 18272 bytes
SHA-256: 3ac10ec56ffc51479dff77c91502e7dd2aec4ad26abf6525a176d8f5292108e7
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 11116 bytes
SHA-256: 4738b1d4636ff8484273fd34d8f4ab5fc46d652b8e83fd539498486552e73f53