Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59b1fd5ad942f6a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 16:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f327f0b9a7233a024477e61b74f8a20 SHA-1: 6f8c4bb86e1e39cc43a1e4fc920a86d07430d8f5 SHA-256: d59b1fd5ad942f6a022565225cc551908086cd8d475254dda4d90fe1960d5ee7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ratosatu.com/contents/files/4140719957.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245f224529---mojawivo.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/fazavinevelategijolitid.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/51780863848.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/lujekese.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/59690571808.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/7999380495.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/20260473430.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/34057630856.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/44349849095.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/pojimiwitid.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/55700978299.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/tizuwasoxaxezegunek.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909080155.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/6473251877.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e480f8c1b6ff08d670b64bf30ca81bb2/garokeraxamuvifiliwopujob.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/vijimijik.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/10957406328.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109110854437250.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/36765981921.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/36681508008.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/83304009568.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/delinawifovavisuwijukuve.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/31509005066.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/90534034033.pdfIn PDF document text
    • http://tulga.ru/editor/files/9303640590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=death+of+me+streaming+vfPDF 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_off0000bd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD17 17856 bytes
SHA-256: a725c7cc1642adea606aa523d3c76901cd9e4eb7614877ce7d37218bda5a7d79
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 10684 bytes
SHA-256: 28016270a7fa0d80055bce94d05aab11d47d1acdca8c2e72f18ad56a2be8eb9b