Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffafd41389f1b7ca…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 13:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 760aac70e274352a66cb2a949d03a9b4 SHA-1: afbb78f93aae82c4139825100b4f1432316f3336 SHA-256: ffafd41389f1b7cafe727a9aa2541d0ee754d01092c9912b7e4098e680ac48b6
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. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tuecpa.com/file_media/file_image/file/74357036182.pdf In PDF document text
    • http://ff-engineering.com/userfiles/files/92135038191.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/ladakoxofubibejize.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/91355870885.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/10085857983.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/edeac9dc75047f04d0290bba56b1d98d/78976298798.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/83110285065.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/koxafajituloweno.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/79934042476.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/muguruvixapuj.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/bodisabijanoretegavolaze.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/kujamosoredux.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/43579316897.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210911183427.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/nesonureresam.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/64994271772.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/bezegapuzevuralumew.pdfIn PDF document text
    • http://adriennemason.com/assets/files/dumamar.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/77657604300.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/58995240422.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/pemexevixofejaxorixebi.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/69453859974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tum+bin+full+movie+hd+1080p+downloadPDF 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_off0000b47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 11132 bytes
SHA-256: c8a658e5675ef14d2f767e5259e6fbebe282d032adec065ccca8aeedb00bd1aa
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 17296 bytes
SHA-256: d86b162d181cb7d711ce944d7597d7a7def0b3dda9b299534931812b26613fa2

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