Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a6d7003c390e36…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 21:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 127cf304ff3cd2f9be87802a6a0d3dc1 SHA-1: 95406cdfac02d8e94c0169d1f22dc8e0d2543bd8 SHA-256: 82a6d7003c390e3643be2ce22385aa480811b126672d635f54c548b431e95ce9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the document is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://eco-versute.com/app/webroot/ckfinder/userfiles/files/raxegakumu.pdf In PDF document text
    • https://bahispesinde.com/gnc/veri/_files/kevojupepoteruvapejurol.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kixeruzabipi.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/73068793792.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/rimerelanagonunekaga.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96037d0f5---96324421782.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/88082166541.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632000123.pdfIn PDF document text
    • http://matras-devison.com/upload/file/789751919.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210916015111.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/besibozanoseti.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/kovuseduraxarajejix.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1632484887jovubawafaboraku.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/tamokexevirikuja.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092410251414.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/93791866956.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161366a4195110---63351518641.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/6113126466.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/40344545451.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/1685161474.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/pabavosenewinuvu.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/2095795290.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/1561837225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=magnus+chase+book+4+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_off0000b23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23C 10968 bytes
SHA-256: b5b507095ee3282c3db357e4e01e80b4223ff5f65807f3d6ddeefc6c33735fad
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 16056 bytes
SHA-256: d1fc4b6d41e33931d919d9d5d21e674bd74d479be16737d513fc64e2f9d325da
font_02_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1