Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5d04fac5c20e10…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 00:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ac7ba4a3937a9bc927f0cf76472bafc SHA-1: 70e23c50dd33051a1803141ee861dc5e259f7035 SHA-256: ce5d04fac5c20e1069aca941aafc9334c6ffddd65cefa5775982bfb5ea3d20c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection for phishing and trojan activity. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dobre-jaja.com/Upload/file/95124134220.pdf In PDF document text
    • https://vnmmalta.com/userfiles/file/kutepakelelelixeweba.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/66344612660.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147fbfc76cc7---deluvetuj.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109101344252044.pdfIn PDF document text
    • https://fond.ru/userfiles/file/27944882693.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/34062632189.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109121227114670.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/wovomekogojeliwazami.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/nuberur.pdfIn PDF document text
    • https://fishboat.hr/files/xusuzosowasup.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/nokofabalumole.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rapoxojonafumanupunajorav.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/72634258026.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/rikefipureju.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/dilisegejuxawogaf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ihcs3mie9keqm5adq5e0t6t4f6/kobopu.pdfIn PDF document text
    • https://zufiks.pl/uploads/userfiles/files/16184172061.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/renagirosutezulijemadarob.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/nujaza.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/84027068603.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/12569174455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+2+lollipop+update+officialPDF 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_off0000afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE7 17684 bytes
SHA-256: 05157ee735199f295860fb5079be053da3c1bd77c4395b82e4e569beadd856c1
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10676 bytes
SHA-256: ef85cc75faa3c1ef737781f3c2703f890b16c0519bdb2e4492456cf6b40086d5

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