Malicious PDF — malware analysis report

Static analysis result for SHA-256 113bccec7652cde5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 15:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c054930d8ba136da0d44410e0cdc2c36 SHA-1: 8da83d72d7470855f3ed2b725b549ed06aa36c3b SHA-256: 113bccec7652cde5623ad4173e0aa818a65b365e2ba49b731837dd05587648ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garnet-medical.com/userfiles/files/80940410060.pdf In PDF document text
    • https://e-room.co/userfiles/file/milik.pdfIn PDF document text
    • https://laser123.com/geektic/files/69706699640.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/24540707388.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/58345820170.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146636f388fb---54133704082.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/80771017455.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nogosaripa.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/99239830795.pdfIn PDF document text
    • https://koratspring.com/upload/file/fijefonisigil.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/36233328992.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/48510644234.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/fukovexidinuripu.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/fotagibunarufit.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/49846519395.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631983780.pdfIn PDF document text
    • http://htcable.cn/d/files/93457734398.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466c9d0fa9a---68742736535.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/30753717688.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/79720824501.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/dotejezenutovuzotupalij.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fozejijepowonamobo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/67182997679.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/90526213525.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/86110558513.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/64057943576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+of+thrones+season+1+fullPDF link annotation
    • 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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10580 bytes
SHA-256: 4920309e73d77a61c3f78c6e064165f59531c1f4d09252c5a5ef7e6cd2f864da
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 17236 bytes
SHA-256: d56c3895d74bd49fd5eac2efc66cc09fd3e39c648b14aba505bd5417965ea318