Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a28a5227863cb1…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 13:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ba8a304a3cc52b811a2689d058ed7c9 SHA-1: af17d1e69c094792578fb30d08b7c81c04a87028 SHA-256: f1a28a5227863cb15b9cfa6248aa451e773afe1b35009d9fef6d01c5bd097602
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://allasclub.com/campannas/file/gegodutusenipi.pdf In PDF document text
    • https://anjingliar.com/contents/files/xuvosajekoxeviruxin.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/65826312187.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/nabeselakasuxowedif.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zedonal.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nivulejeputuvozawotoriru.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/83494989925.pdfIn PDF document text
    • https://phr4u.com/files/vulipigutedafunabutital.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_025004.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/93536043513.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e480f8c1b6ff08d670b64bf30ca81bb2/garokeraxamuvifiliwopujob.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/71355895086.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/zafuxi.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/37776365966.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c769647e589eba75c5102a59077afffc/76665654014.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/8971981828.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109062050539350.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/nupenerowofisun.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/34452708059.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/wajeponi.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/rovejuxipewozipuzuziloxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=programar+un+juego+para+androidPDF 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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 14784 bytes
SHA-256: 2762c2801c8d6168b4801970f82fd4e0c754e51e40ef9e0f0e20a81383e81755
font_01_sfnt_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 10652 bytes
SHA-256: 3569ee85549c175f90c13ebd69c0a2de6d23639dc210495096c1ea65cb35b8ea

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