Malicious PDF — malware analysis report

Static analysis result for SHA-256 14423c5deec17901…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 14:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aab71dffce4c6d03c95c9bb863d63387 SHA-1: de395440caac295e90eebe1da8cb6ac52c6ce1b0 SHA-256: 14423c5deec179014e457204fdee3aa04514c98fb33bacc007d1d623bc0b29b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link-farming operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=cara+login+email+yahoo+di+android PDF link annotation
    • https://nulifeus.com/~nulife/userfiles/file/39858521737.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/rebokekikij.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/vuxaxomexa.pdfIn PDF document text
    • http://melabo.com/upload/files/zatibox.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/66158839542.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/48500332061.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/jezulanafibi.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/kujifawalozunokegaw.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210907205400.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/591278821.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/75347162063.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/junuwites.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161349d98b951e---jutodaguvuxegamisenodi.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/sijonivobodu.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/3529884062.pdfIn PDF document text
    • http://soupworld.de/upload/file/67336247715.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/65374953055.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911205121.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143da35c8b0f---benonij.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091309031673499.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/gijomosexeresaju.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210917_045552.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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10572 bytes
SHA-256: 6d7f51025a1fc3a231ecd3252cf8a772b91a49f1049150e43b974a33a554031c
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 18884 bytes
SHA-256: 49b0d392ccfaf40752ae2a5cb569042c8d08c928f3ff236920f8a57d71f209b5

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