Malicious PDF — malware analysis report

Static analysis result for SHA-256 1279cfe933a08b06…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 16:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ec87b99ebbdc36c4b76b2ea97e22ce2 SHA-1: 18ff0de631540362e05d9c3953e9195e04931bf1 SHA-256: 1279cfe933a08b06ff3d711664558e110a6ce9e8a17299f4e04548bd302f7c0c
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, indicating an attempt to redirect the user to malicious content or initiate a download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://haps.company/wp-content/plugins/super-forms/uploads/php/files/064274f6fd448552b5ce490032f1614c/luxafowuwebuzemugeziginu.pdf In PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc788c3fe---zugodorimunapizi.pdfIn PDF document text
    • http://gaudi.tw/upload/files/poxawizewugaziroxasarutuj.pdfIn PDF document text
    • https://camphacement.vn/upload/files/vuguxetimoviwe.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/xuvurosupagesikefemitigaz.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/46868389345.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26166333439.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///8871595746.pdfIn PDF document text
    • https://kvzriu.org/images/file/44829190952.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/mizubidejisilakanifupi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/67614518295.pdfIn PDF document text
    • http://zzquansu.cn/d/files/30546201914.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/70094998492.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/26053799090.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/22056881860.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///ravigaxatap.pdfIn PDF document text
    • http://exima.kr/userData/board/file/69494265778.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/16148143880.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/80039933453.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/11423370226.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/koloz.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63894819107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=controller+for+xbox+one+apk+hackPDF 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_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 10680 bytes
SHA-256: 2a88fdc4b7bff9c3d67143ba8d26cbea09fba8376a385007898a810e73c556da
font_02_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 18004 bytes
SHA-256: 5404e59e9bcde4a7cee6c96e811fba87311a0d608fff2757080b38e6e45bc165