Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf722c8a54a50d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 22:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c98bd3af62ef182ad44c4ecb7302e9ad SHA-1: f0664fb5bb10ba81c8b8949eb481e865cd732bd5 SHA-256: 8bdf722c8a54a50d81e05ef64a6913030c76c074fb67ef6209c7f2c4ffe77673
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious image-only lure, typical of phishing campaigns. It contains numerous external links, including one pointing to 'crysiq.ru', suggesting an attempt to redirect the user to a malicious site. The ML classifier strongly flagged this PDF as malicious, reinforcing the suspicious nature of the embedded URLs and the overall document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=poor+dad+rich+dad+bangla PDF link annotation
    • http://eia-edu.com/userfiles/file/62106890516.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/98acfb3cbd5084ba1627a158c51bf4d4/sonetapiven.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210905235641.pdfIn PDF document text
    • http://chicopharm.com/upload/files/gasepexufemusuzojaxedu.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/kopivegudugexaxinevawov.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/fewukonununowuximu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/lisetironazixa.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/98749746313.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/bexokutexezevimuwuwige.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/ronugipupofutuxiv.pdfIn PDF document text
    • http://katachizu.com/img/news/files/80730218042.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/uqnu7fmj1nha4an9kuc3avlq1t/rujipubanexarepeweke.pdfIn PDF document text
    • https://paradigma.bg/uf/file/pekigonoluxatibul.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wakorerikibegox.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/54006723077.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lojetopitorurikebaf.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/wodifexuwaluride.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/3360308501.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tebamivugoleva.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/kajojebuwumubazoxedorotu.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/61326166022.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/labupigijegepunowebebumuv.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/88735690527.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/84029636077.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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 10392 bytes
SHA-256: 3868e08c5fce76c3b04ee069e196672cfcb5d917101f2818f758d817a91e9bf0
font_02_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 13752 bytes
SHA-256: 1c76e4326cc93fb34ebaa33105ad3b2dfd7cd8b0e4437132f102403fc421ae24