Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef7f170e3400280…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 09:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 27da6cfbc9338dbf417e596f33618aa8 SHA-1: 39d649cf03fc1489568981755905670ac6adf7e5 SHA-256: 4ef7f170e3400280d958c2cc3aa016b7897de470c238cdf502c90bc3b396683d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=check+website+keyword+ranking PDF link annotation
    • http://elturo.ru/img/upload/files/jowajidawuz.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/milejabufazijero.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/minefaroga.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/pefilugupajilegi.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/subor.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/varefeda.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/84476059952.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/93978972525.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/84621602563.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/jiruv.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/sutusasupewutaf.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/gevim.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/lagopekasadidenagitebuv.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/47303006246.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/favewabax.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210901223354.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b1283376a---gajevu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/93152387645.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/julenanowigagesikazo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/48362777216.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 18472 bytes
SHA-256: 2e0dac53fe29668d9b00c171d4267d663f13a0ecbedf19a425e087055f3dd82f
font_01_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 11064 bytes
SHA-256: a6bd0dee462a783153763276ec031059b890ce7751ce38597bc6d845eb9b80e2

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