Malicious PDF — malware analysis report

Static analysis result for SHA-256 8170119a72f92d28…

MALICIOUS

PDF

195.6 KB Created: 2021-10-17 20:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8667a1cc13a73ed652d14cd20ed5cdbd SHA-1: 551f203ea08f7f5fbeb8e1f46ed4302f66ae9126 SHA-256: 8170119a72f92d28ed5cb7260a3664f8cc99cba4eab659339087ae3abc1a1e81
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a visual download button lure, combined with numerous embedded URLs pointing to PDF files, suggests the document is designed to trick users into downloading further malicious content. The primary URL, ketchas.ru, is likely part of the initial lure or C2 infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://ketchas.ru/uplcv?utm_term=which+word+has+the+most+negative+connotation PDF link annotation
    • https://familienbilstrup.dk/ckfinder/userfiles/files/28757046005.pdfIn PDF document text
    • http://mutitar.com/user_img/files/43375084249.pdfIn PDF document text
    • http://onlinevay.com/upload/files/87533076852.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/77469105642.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/21689550592.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lamabaj.pdfIn PDF document text
    • https://plasy.com/uploads/file/foralezivelumox.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/riterofenijodebora.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/jemosogeferepefilu.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/difikemafenewatuzosizefa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4c12d7a86f9703689decd0a72ad50773/67596690208.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/125acf3fe3b1b581abed2e860404c7cd/meferemexunevali.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/jesatanugir.pdfIn PDF document text
    • http://speckrepej.com/upload/file/mugetixutowave.pdfIn PDF document text
    • http://rc-modeller.se/images/file///bugenilew.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/90390003629.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/89017777630.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/53475586328.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/55572580346.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/57626050632.pdfIn PDF document text
    • https://terracell.pt/images/file/10596841546.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/44062468772.pdfIn PDF document text
    • https://isleo.com/i_photos/file/62534982362.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_off000299a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x299A8 20544 bytes
SHA-256: a783bfdfca4d99f522cb5d5656075e2e34e449c1ffd4ed7c7aa0399a08554d4e
font_01_sfnt_off0002cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6D3 10916 bytes
SHA-256: c499609433836af48baf94e7ba0e8a89a57c3544f04d084eeb0b4a7e61da7d3b

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