Malicious PDF — malware analysis report

Static analysis result for SHA-256 2457eff1568fd36b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 12:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a0a54a1e08f4cbddf93b8b27458bdc6 SHA-1: 3686a71a45127f05457aaeca622dc7e6b94330e4 SHA-256: 2457eff1568fd36ba77bb9e55d49103b4534c9639d068dc1626847f89ea5af67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://ketchas.ru/uplcv?utm_term=downloadandroidrom+com+apk PDF link annotation
    • http://laibros.com/ckeditor/userfiles/files/turikirisanivowuregiv.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/93395772772.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/59218200600.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/280ca49de505d9693fd3497ba80dee22/robibomozuxuvimonimo.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/84088500693.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/9108519659.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/lovobemazovadujiwekani.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/33620090485.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/34351409472.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/8513452219.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/kexixapevakapatemituda.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/97528956363.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/67010299645.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/48123605444.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/21427957545.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/64708034999.pdfIn PDF document text
    • http://trieuduong.com/images/Download/topozewonivajaxotav.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/95108871868.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139311d3192d---jupewaxipabetunogowifafa.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/diruribamivalizib.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/6382026194.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/56156776951.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ladojowujubumadamugiwefu.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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 18148 bytes
SHA-256: 1e6f5197a1ddb6be6ead83cb0576ab02a058c81012761c4971b7deb5cae8801b
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10456 bytes
SHA-256: 0ca878334924de6d3ec2dd0e0f632fd9ef305ef6a566c9dd08ab848409a34b0e