Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b798bd28a166f2d…

MALICIOUS

PDF

81.5 KB Created: 2021-10-08 07:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 186bd4c534ef70a7f6f3fe7681d5a7d8 SHA-1: 9c3b99b1b6738360d30846f4006919af1801097d SHA-256: 7b798bd28a166f2d0c47a3bea8874d058a2a55e5a146320571128173fe7f5437
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lustigersteirer.at/userfiles/file/tifonisutidaluguzurepo.pdf In PDF document text
    • http://zavalinka.by/var/upload/file/41440594432.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/10964425466.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/65255849759.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/45757272364.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/remejofuzewi.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/41096629778.pdfIn PDF document text
    • http://capital96.com/userfiles/file/32421551307.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/56469951003.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/94533499235.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615434bdf19f4---lekiwuzegedibad.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/68583505685.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/81909084985.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/90492379626.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/41771177473.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xemizi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/dfcce4e59b82526f301620501d34641b/85833681759.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/limenijobimakin.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/lusavoneredotifogesaraw.pdfIn PDF document text
    • http://nincity.de/inline/file/gapoxapifabamedoxagifulaj.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/jibogu.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/vikepaxeposavuxeragufip.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/libijudaladevemunekomaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=high+platelet+count+in+iron+deficiency+anemiaPDF 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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 11104 bytes
SHA-256: 37dd39478bd264b2be74ed92a33fa86c873ae8897a3802c94f1acc18c9791e24
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 18740 bytes
SHA-256: b06e0834f6c6fbcfd51a41cffd74fca6d32c25e37133fe7030481d9966272b79
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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