Malicious PDF — malware analysis report

Static analysis result for SHA-256 866301d8597927c5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 10:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72517c24cf08f89635a8dd31ad430d49 SHA-1: cd501e0e6a6c1d9aa58fc46b4d4ad0a38ad29960 SHA-256: 866301d8597927c5669464418454940d9add23134c4077327ef974546e7457e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to trick users into visiting 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=iphone+6s+plus+stuck+in+recovery+mode PDF link annotation
    • https://charming-dc.com/uploads/files/202109031605188637.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/tijovumuposixe.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/25031853113.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jujanuvutisovonesetun.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/39809435892.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/80222603013.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/nowene.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/patanavoguka.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/neduxutugazunifunez.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/81344460506.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/29620659758.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210909100350.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/15615962755.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/kudirafufunoras.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/8661816472.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/kovawotiburemazu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/55961651782.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/67920935560.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/65082419803.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/68178961824.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/69900847177.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dokezofibanixajokusele.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021982250444449.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_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 11108 bytes
SHA-256: 0769f110b43087961928b8b5c95798ad6b990be92e0577b5a717de475e96e4b7
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 17600 bytes
SHA-256: f7ab845edcd83649fa05c95ba8d9fad258120fe7d20b534ace26272ef994ff26
font_02_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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