Malicious PDF — malware analysis report

Static analysis result for SHA-256 20729e28e09be336…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 16:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45890fd0238c819094b1e2a20b3f95d8 SHA-1: 8680556253110d6a92e9ca92296bd543e3e14e22 SHA-256: 20729e28e09be33632b9fff13804efdb0033e2d6783b878164e133aa4f1c5d84
126 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a lure to external malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hitelesen.com/userfiles/file/20641722764.pdf In PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/88940604195.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/foziwelumenemobadew.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613283cc97b16---tisebosaridup.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kirofeto.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/487479343.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77142b7e0---60979317494.pdfIn PDF document text
    • http://rsentco.com/upload/file/158886228.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/wafusu.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lukajupelakom.pdfIn PDF document text
    • http://huefpdf.org/upload/file/71074857190.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/4025798808.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/76082794298.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/pavupemesemezudurujavetad.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908031434.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/zilugukufi.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/19555070718.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/37485152738.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/4912317700.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/ridirupafedogubab.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/32857110160.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/89968598973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bully+obb+file+download+for+androidPDF link annotation
    • https://easyown.ddproperty.com/datas/files/lokaxewavexanifuv.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_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 17160 bytes
SHA-256: 01750c1178612909edd587587f7e042e35b4838db0a816758a29cacf76c8b7da
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10576 bytes
SHA-256: 4019f8b827008b42b9f489fe66a0984194b71dae14a59c91ad52ecf57b2dc40f

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