Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e50eeb39c3607a0…

MALICIOUS

PDF

59.6 KB Created: 2021-10-04 12:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d2c9cdad74b988223bbc3314d7d9820 SHA-1: ad1243354936da66677fd813ef2bed0a574218a8 SHA-256: 4e50eeb39c3607a05829043a7ee92d11fe10b99a957f61ce086851eef42c3f99
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or traffic redirection scheme. ClamAV detection and ML classification confirm its malicious nature. The presence of embedded URLs and the heuristic indicating a link farm strongly suggest the intent is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5382

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://huntic.ru/uplcv?utm_term=synonym+for+hardworker PDF link annotation
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16215555292.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/powufarod.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/68239700433.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/69203901142.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613f127399468---72843543452.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/zekisema.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/99008703621.pdfIn PDF document text
    • https://empresa-venta.hr/files/48274973283.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/gukirasanazilitenizabosow.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/muxufobememejaset.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/xesidevejomisik.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/mefewed.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/69792043527.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/66993806546.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/rezubevanujemorubedorire.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/45974788784.pdfIn PDF document text
    • http://kasand.com/userfiles/xupijawivuwodiloberos.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/34592777099.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/34045008183.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/zikoxonav.pdfIn PDF document text
    • http://cloverdiamond.com/file/jewenepufe.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/bedole.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/wixijenerewasuxup.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16316001511.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7a0e39f03ffd74ffd5ea5027619aa014/45561365041.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/bimegawubavojaborokune.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 10580 bytes
SHA-256: 20510bd3ffac2d0035167e2a3a591284ea0ba217b63e6402aaebc33d11925e54

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