Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c8691de96d163b…

MALICIOUS

PDF

96.9 KB Created: 2021-09-09 11:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99c988776d918d794f0932525468e8d8 SHA-1: 62d3e6579ff6c63ec9a92424942bbc41d58c1e6a SHA-256: 95c8691de96d163bd8266745e770a11c096df38e6e62cf9024fda0ef21070e84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hennel.hu/sources/elemek/file/12701456496.pdf In PDF document text
    • https://jjpremiers.com/files/tizarinaramikofufagovet.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/57111543779.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/7080075564.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/8961157786.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22130963744.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/10277321559.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/55718759562.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/2616255476.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/33052576055.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/debid.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/83677154092.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rogotozonenunikonag.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/xokaratojawuwexadixeva.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/zipewoneduvowunepo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/julonosebofanewosidobu.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/25756907460.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/jowametugegaxalunugefefa.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/zikureganizamavul.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/rovuzobavex.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/25805002635.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/wopojiwewizasizug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+avatar+movie+online+free+streamingPDF 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_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10844 bytes
SHA-256: 9e98970833d014379d1d261cbdfcab0b2bf524d93a9f804b46be1f140f64d684
font_01_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 18932 bytes
SHA-256: d8bbf72920cbc140adff8ef80ad75bed5b61f3391f7607ab7134296fd2c8a347
font_02_sfnt_off00015f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1