Malicious PDF — malware analysis report

Static analysis result for SHA-256 b582f12c15caf81e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 21:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d28ff9764a1a81e4bec7b7ffaa01c9a SHA-1: f8c401e9579b34950f5c29b8264e6583473486c6 SHA-256: b582f12c15caf81e7f7299249955d6de509fcb968a09a98daaa0928e1f3a11d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to redirect users to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=you+nazty+spy PDF link annotation
    • http://droneducational.com/admin/userfiles/file/55801139869.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/gemelizazekiw.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210901110629240016u2w083.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/92564193786.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/zudoxawikuwe.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/voragefupudofaxapaju.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/98052604110.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/2269252565.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/lutiwunidepolipuvuge.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/daxixilejiv.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/67190241144.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161338247e8710---rukokodunenevobupato.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16999637991.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/bojavorawisevodo.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/guposirodefika.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/wobufaxasiratawego.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/11743415710.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/tolama.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69061029496.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/dukesosagita.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/93345793437.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/31683426673.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613257dbe737a---90272486543.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/28992099976.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/dutegemumobijodudefib.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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10132 bytes
SHA-256: 817aacbad7dd9a6639116636d0d8dda044faaab1d76df7db1a346b4a42acf98a
font_02_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 16728 bytes
SHA-256: 5964815c040315ede249563b6cdea88deba2932f9e96085893bfd83b0b72f6f9