Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf730a831d7dfa6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 22:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bad9c5974457454a5bddc205ac859753 SHA-1: f79706632f6e5ce6858f622107a78ea11cb8e520 SHA-256: bbf730a831d7dfa6d3ff2aafcbbcff09b64546600343b36c857f78d03125f714
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation that these links are intended to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bannermaul.com/userData/board/file/18350778861.pdf In PDF document text
    • http://geologicatoscana.eu/userfiles/files/jaxonixurupazugidamobizo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pijogonizidagimovokikogu.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/tetife.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/nijifulapikufafej.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/20605538486.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/9630429587.pdfIn PDF document text
    • http://umhouses.com/uploads/files/13826016329.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8f41541f018a9aacec8e0d38a85edd53/66874506071.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/44985191272.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/pixovokajalatebaselu.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/494646083.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/16831416312.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/74779731665.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/gidomigesa.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/woxozu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614162ba51ba4---38991875102.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/27496610735.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/31869902146.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kavekosipepazedawem.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/13580665311.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/fonesirapevew.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/vafiw.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/medagikezivez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zee+tv+old+serials+watch+onlinePDF 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 17320 bytes
SHA-256: 60c5b6f3bad084538dced65edc0a298c39afa2e1e89fab3ee7a27a5949169397
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10580 bytes
SHA-256: 8909703c9987300913b79385fe314e781e4d77e5cd39a3df5add03deffb8c527
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1