Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6de98148c9fd7f…

MALICIOUS

PDF

99.7 KB Created: 2021-09-18 22:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 790fd01fbd7220425748754226569d18 SHA-1: 25d4718a380f83f66be4bc53149df86919959cfe SHA-256: fd6de98148c9fd7fb38d10d0468a750b1cf2b2752e327a249c4f744e69453392
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, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external PDF files, with a high concentration of these links on disposable or unknown domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://0575zl.com/userfiles/file/37613413863.pdf In PDF document text
    • http://blccy.com/userfiles/files/5812553995.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/82466649740.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210918165658605969mzi4af1g81s3.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/nonomipisexudes.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/buxetutuvibigakonufawat.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/xirupaseger.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zidijik.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/95266984485.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/bekowaxozilenemasoronat.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa23e9e68---45959412564.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/keviwexawawonug.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tilebagufufobetulut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139522c3f572---girabowotaketus.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/61352759647.pdfIn PDF document text
    • https://tpk-m.ru/files/file/254445022.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/fabef.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/96328497105.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/20635202129.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/domubifebijodaresosi.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/78380616677.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/27666877942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clean+code+martin+fowler+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_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 19084 bytes
SHA-256: 5a7e035827f8b3e05cff1b7aaf49468f35d6f64611c495e7e7ffc7fd0543e18b
font_02_sfnt_off00016853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16853 10728 bytes
SHA-256: edd11e04babdb4b5177381849a38059d3452831bb475763b317554e589db9317

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