Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccb45f84ec6bfe6…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 11:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4b6dfb5aad5215d88c7992f962314b6 SHA-1: 034c7235e708f002ca8685243a3a10c1634394cd SHA-256: 3ccb45f84ec6bfe65a829d39e9375c94536e4cbb6fca289dc34fdfc599ee43d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous links to external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the malicious intent of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20842f945---sigepanap.pdf In PDF document text
    • http://civicwomen.com/ckfiles/files/xojunubamojenuveru.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210911_0A3D9B1893146D3C.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/nuxevofipusum.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/tewubijijelapetuwelalare.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/dovofojomumotanulanagapiw.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/94096420222.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/67724412195.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/pororogemawokiw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdc21cfb0---gijatuwofunevubuganukisag.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/nemedobojivegugejimi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/fafowesunafabatodojeve.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/pepofigosewulisaju.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/komem.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/dibevo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/33103710910.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/gojuv.pdfIn PDF document text
    • https://elemonbg.com/Files/File/80176152462.pdfIn PDF document text
    • http://vucert.vn/uploads/files/31871974731.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/domupobimoxedoduj.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/16343542080.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/vopimigodewasisu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/warasulidalux.pdfIn PDF document text
    • https://atl-50.com/files/file/nolorenetomaluwoja.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/26398167789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=in+the+first+circle+pdfPDF 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_off0000cff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 10384 bytes
SHA-256: 20028633de78aee6f8d8428ce36e8dac86617ee56ba11be2ccdac78adc3d5dd6
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17332 bytes
SHA-256: bf1a235b878b9d11d22ca44461c4392399850708862e3e2e7d2cd93df5652621