Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ef7f62ab132b26…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 12:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19c64d122e29f3f88958f9e70c5a5f10 SHA-1: 46e8068f3e4edcebcbcbf92a28dac23611ccf94a SHA-256: 08ef7f62ab132b266fa9d55161afca7406d667627f7c99be48bde206a57c39b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to suspicious domains. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary goal appears to be directing users to a network of sites hosting other PDF files, potentially for SEO poisoning or malware distribution.

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://vinaktv.com/storage/ckfinder/files/78353674795.pdf In PDF document text
    • http://scard.vn/app/webroot/uploads/files/2601031054.pdfIn PDF document text
    • https://costarica4d.com/contents/files/furupemedis.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/muwufiburov.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/54007707504.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/46600691797.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/58714633116.pdfIn PDF document text
    • http://dejede.com/userfiles/file/67439274460.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/36478545066.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/venuzix.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/misabob.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xonelixuxulezuzubowamag.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146ceeb9f420---58366206206.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210917181247.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravozawadasomi.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/31170066165.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/35138652501.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5c90b9c9---nokalumi.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/nikejetuketevisopixo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/paloribixifuwo.pdfIn PDF document text
    • http://skolky.info/foto/images/file/9516753595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bhagavad+gita+in+english+pdf+downloadPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/8662660243.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_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 18284 bytes
SHA-256: 7eb34d12e3bac950cec05a110c6695226dddde9597eadbd92b6624fc3e3426cb
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 10884 bytes
SHA-256: 6e434559092c13f244d55fb0bfe01635daab30c0c61e80a37425a1c694607794