Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafece88aec6f512…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 11:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e73106af41db7548ee378b5fe1c49eaf SHA-1: 123d7ba8e50ae81f4442414db04b1a9056a51777 SHA-256: eafece88aec6f512264c95cefadd2b49c7f42c66ab7b0b278fd942e35d349d49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://umrllc.com/userfiles/files/sukapaxesimoviredizozat.pdf In PDF document text
    • https://avflash.nl/upload/files/vaposufuni.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudodobesonetovibilixuz.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/29976280263.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/80009036019.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/76818295850.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/pabuxutamozop.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/6957136387.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/11221723821.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/dufufozikedip.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/48102362115.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210902064829211428.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142481c5fbdc---vabevetenajukosawipija.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nonikiwepaladitinilixam.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/44681223510.pdfIn PDF document text
    • http://unityproductions.com/upload/files/lalumebofaworuzexex.pdfIn PDF document text
    • https://rajaunited.com/contents/files/tokajulazumaga.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161442db64bb82---tavuwew.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/38314110268.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/mifafumosarupa.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/zoxujobaxevoxasuvigu.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/46067534642.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/27413881167.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/darowumetizix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=clean+master+windows+7+ultimatePDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 14732 bytes
SHA-256: 47942562432cd5dd9262dc24e481ff60e4d1454c0160f6ede7e77069cc593301
font_02_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10676 bytes
SHA-256: 894c8a4f3faa56868638afeb5d2d200d035ee81af3bfede20189541325cfd0a6

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