Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a7282ca138e7d9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 22:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f7fb42577ca51c901df1d5c3c22fe65 SHA-1: 1519a57b37c406062c222e1d47963205b8f8807c SHA-256: 47a7282ca138e7d94b63a941dce46cfeb24a12d18876347c4f18864b3d8aef4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the sheer volume of suspicious URLs points to a high likelihood of user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=best+hookup+apps+for+over+50 PDF link annotation
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/fesezimapadutekifodid.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/desuvazumupak.pdfIn PDF document text
    • http://etkenkalip.com/files/logotoxogidufozevaze.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/96106023649.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140dcdee54fe---3119113974.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/46514796084.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/66193880919.pdfIn PDF document text
    • https://loctra.net/userfiles/file/853795595.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631066956.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090910213250.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/51553628541.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/mesifilujavo.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210916_060338.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jupet.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/xuvupixi.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/dipovuzokusutipa.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/80434981171.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/lowekegoxupegewutowuseb.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/jikutozikepepe.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/80788989613.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/59751258321.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/44529959676.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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10780 bytes
SHA-256: a20693466a082dc6728e88f40970eb86608b93f2205db4cdf16ad0e936314d07
font_02_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 17728 bytes
SHA-256: 02d5b9e4484ed70537f21ba07f733a51704c1705187b29d97331765baaf48b19

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