Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe6fe618ff5892f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 19:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cea13d0ed0d45d3b320bcb694ba9f8e3 SHA-1: b6e8bc25974209ebb52ced9e5c78f4d89f59deb1 SHA-256: cbe6fe618ff5892fc5b8b0c4e3cdf7342808df35223bc78f8579ab5c163ba38b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://big-blue-bus.com/pics/fotos/1/file/62627895217.pdf In PDF document text
    • http://radyoislam.com/resimler/files/769059346.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/13591018641.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/80558578877.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/momiwufo.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/repitelekedufirikosukam.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://astprom.ru/sites/default/files/file/16048771110.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/fijedofagezunoxoxaleger.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/gosoluxebujawo.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/gamerikozuwekini.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gemiwuwewosotad.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131b73c2dd63---60295979237.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/90411358247.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e61e86da---vipomimidukadakev.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/68330474461.pdfIn PDF document text
    • https://equinox-e.com/upload/files/95257328599.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/48214161565.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/vuwizu.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/tokaparijijisax.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/rawuvamewemosobav.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/33639958192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=late+dumping+syndrome+pdfPDF 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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 10968 bytes
SHA-256: d83659798ef328ac84937b97959bde011e3f4bc7752e3baa91cc7cbdc9619d19
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 17480 bytes
SHA-256: a4cad02edce34af3c09a448c35ed8a37a9b6ab502a833e64b34162dc05cdf5fa
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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