Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad94f41c71f3e187…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 05:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a9755d3f66e45ed4b5a9c4bcff0a97d SHA-1: 4b4266271e839a291170888e76bc2aa7b4126e3d SHA-256: ad94f41c71f3e1871759a4dbb614204a03178ddefee68889fe454c46ea35ce68
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links on disposable domains, likely to distribute malware or conduct phishing. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://casaperugia.fr/userfiles/file/73520274426.pdf In PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xumitarotaruvopa.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/kaxusezofipetasumowojex.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/bukafaxigupe.pdfIn PDF document text
    • http://patroha.hu/file/pilox.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/1490642023.pdfIn PDF document text
    • http://vanhacollection.com/images/files/muvawuxitujijejamonoj.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/rojigaju.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6813e5f3878d9dcf44c9a13abc449583/89375670662.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/rotazafivupoguxixiboxe.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392abfd825f---sededikem.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/13583196603.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/86011797289.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/91659212300.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/26236162748.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/sijoxuvekisekukegavivoxu.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/dereza.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/jemomurupuzezubupi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/podanasi.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/30575114619.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/zijelonude.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/ruxavaga.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/69806031926.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/82054654571.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/20630068341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dance+moms+season+2+123moviesPDF 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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 17904 bytes
SHA-256: 5c69c3199650141fe1b975f132ed5ed21a75db232a2c8ebaa939e2e415926c30
font_02_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 10556 bytes
SHA-256: 3339aff692c82133a2e8f81ec2cf14ef341fda2b6d7a6319959fd74847a42d1f