Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3a3d8ec5b47946…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 09:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 883d894a89aa67df6183f60ba59b7974 SHA-1: 0f555694d9c1157561aa38ef1378fb81b5c700f5 SHA-256: 0b3a3d8ec5b4794693e04be5b8f5b8d9dca7ba0035d98fa00da2eab7df9b2e57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classifiers and ClamAV. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of many external links indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://decom.pro/admin/ckfinder/userfiles/files/bugedetifebukesenote.pdf In PDF document text
    • http://dreesmann-foto.de/userfiles/file/38703147354.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pftm43tfdtf4887o471rsnhn66/32170334783.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/95776796548.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57663847590.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/60000539596.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/zitesojun.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/63881514363.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rekobosifovepi.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rowodizawubekemezimuvol.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/bodamuwer.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/10364287804.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/jukadazugogoji.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/10619795228.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/93878913860.pdfIn PDF document text
    • https://maisonforville.be/documents/file/fekafatonovaguzelovogotaf.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/78152755913.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/40512890490.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/49763057072.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/jaxukoledadolixotulesizir.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/fefulamedozizolovokomolu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d223e0b23---48148905522.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/wafixab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=smash+bros+n64+downloadPDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 10740 bytes
SHA-256: 3df9295119cb05bea853e961f8c031a144caea60b4c7ac71c790b193501ab093
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 17284 bytes
SHA-256: 8bba481d4a823c48c4272aabe42c94df0b7047d13d3cf134f83c175811a45219