Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b00ca4a374f7d7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 02:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12f852d02eaa11a22ad0fd889a7f0b34 SHA-1: 1028b6ce2d6990d28fbcc45dbeddb2a18c3df79e SHA-256: 04b00ca4a374f7d75e166f8a4531baacd9b46a9644059fd76d12eb261c2d558c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous disposable links and a link farm heuristic suggests a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a lure for downloading potentially malicious content, such as an Android application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://northcoteplaza.com/userfiles/file/tazokuwubagabeju.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/fozirebavokafedupit.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210911075912_sryd4g.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/rilojikugiwavizo.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/16754965875.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/runifisuf.pdfIn PDF document text
    • https://digireg.ru/upload/36255792496.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/49321730137.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/matuxirefowosugiluj.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o2fco71oi0nnoue1g0571hb4tm/siwad.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/mejas.pdfIn PDF document text
    • http://vce34.ru/attachments/file/vizisixufesosujulafeneb.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/25741106719.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/rejunigipisojugafib.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/fofesesigedoja.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/22258945442.pdfIn PDF document text
    • https://novsport.com/content/File/mabaforeladusuruzem.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/gosevu.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bosifisinaziredexoleded.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/zalepawolamufupe.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/xideligozumofaben.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf4e06eb87---wabejunepuladubabevejoso.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/58547666919.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/safawiw.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/revivakexezawumisowimot.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/68616571826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+apk+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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 10144 bytes
SHA-256: e1efb9893638e9b200c835709dff233f08d9c21c251d6fb98a07cab7db9115f1
font_02_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 14980 bytes
SHA-256: 61f198caf82478a343a8ef646531212af2b5405f5bcdfbbddd09b148b7832070