Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a350e7dc799479…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 07:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 54ecd1fe14ffb2f6e47f7736646aed3f SHA-1: b9ef564dc5f55f340fe6366bd53d47405bb79277 SHA-256: c6a350e7dc7994799599829d02f76d230b3d8ea0967a75219fbebbc1dee92807
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shepardinteriordesign.com/rw/upload/file/42177502094.pdf In PDF document text
    • https://alibrahimtravel.com/mycms/uploadedimages/editorUploadedImages/file/vixekefoxaxenevefaf.pdfIn PDF document text
    • http://land89.com/ckupload/files/piwebubufefivigevopi.pdfIn PDF document text
    • https://3redsquares.com/phpsites/vertical_living/uploads/file/vonakofa.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zidiloselevurub.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/nelotefapabadam.pdfIn PDF document text
    • https://chptravel.ir/data/file/16102538197.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/55579354998.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/86256829157.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/wedoses.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/vuwonapatutetuweximuwew.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/12910452252.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/nafugubumafudokikajanofop.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/xukupe.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zatolowoloxur.pdfIn PDF document text
    • http://levotst.com/uploads/files/40047459821.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/61904308849.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/17755210864.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/kirebisunopuzakape.pdfIn PDF document text
    • http://napiarsaigh.com/images/navazufarifemefig.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/37922415102.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466c85c740b---zufusegipinamubaw.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/tulafutinanebu.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/5305347157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=amazon+prime+video+apk+tv+box+mxq+4kPDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 18032 bytes
SHA-256: 53bbb74fe42a4307f4c0533ac85d26caf03185850a8b341d760f5461405cfcaa
font_02_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 11004 bytes
SHA-256: 0193796caef52d8bd72e4af983bdc89edf9ca01e840938eb457ae83cf72f7c1e