Malicious PDF — malware analysis report

Static analysis result for SHA-256 95247d6d407862e3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a13839d6948b90f7d693d030983304f0 SHA-1: 4ae7366463d90b64d042e4df5498000ec9b48d05 SHA-256: 95247d6d407862e3628cd0f609ff4f9dfc1059396d36a4e228a99d05e4bcf94f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, suggesting it was programmatically created to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=telechargement+gratuit+jeux+pour+android PDF link annotation
    • http://navigator-nsk.ru/userfiles/file/14200312441.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340cd183017---roladam.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tuvazurotani.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48335623081.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/11617e7076c20fe6147212464e33cf7d.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/xabibusafiperufu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/12611580716.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/98848042007.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/91881cb97b536fb24c8e069fcc07a025/39469579627.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/zixezawu.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/84130323559.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/20983119819.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/pubanijowokitalazok.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/53105365299.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631018824.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/28657338546.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/gurubomimodufo.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/vuvurep.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83929151231.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/bevupogan.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/21137825244.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/xizudikilizog.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/65282822971.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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 11088 bytes
SHA-256: 342c6b776d36efa201eae8bb6ec7bc60ed4f4f6a2a14517f40f24a7ed5455e9f
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 18808 bytes
SHA-256: c5075919bbd59abbfc863ad29f7cb7c92c6e9d73cc7e91a4f03111b9c979283b
font_02_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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