Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3d969466e47160…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 10:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b73f70fcbd9b57f996d7ce63a65b1147 SHA-1: b081fc7537ef332e7406d6211cb527233b129338 SHA-256: bb3d969466e47160856bbf6d8e04b51770bf885fb6a772b726f7895f6580d31b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.hkha.com.hk/ckfinder/userfiles/files/93604091801.pdf In PDF document text
    • http://maryalo.com/userData/board/file/93074135042.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c056c5094---lojogunebil.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210927121520.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/seluxiro.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/xonenita.pdfIn PDF document text
    • http://billsky.ee/files/file/88662808772.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/56153694555.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/54341883691.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/34648625672.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/29049310115.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/17407853459.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/josatepoxetedene.pdfIn PDF document text
    • http://i-physiology.ru/upload/pogow.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/27942275958.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e7765584045fc195646c23ce5d172605/50491372023.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/82549181227.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151128367449.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/8491203427.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/xutoxivuloxupotep.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210911135445.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/divujil.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/84350685410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=play+store+switch+countryPDF 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_off0000aea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 16208 bytes
SHA-256: 88173c73754eadcdef18eeca9ae0e02b371a1ca1d7e389b6bbb062910c1e08df
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 10628 bytes
SHA-256: c88e0775a12009675bed89fb2eeb0a9a0d798ba8f8b8054e9d64a0216d81b471

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