Malicious PDF — malware analysis report

Static analysis result for SHA-256 573228d1f1fb7696…

MALICIOUS

PDF

73.5 KB Created: 2021-10-06 00:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aafbcae4f379a5c0de7c97a50cdd25f1 SHA-1: 581e9e3fccac6533ca8e6b6d1d03d2af3c8c4abe SHA-256: 573228d1f1fb76966bfef0cfeddc7601880dbaecc1fddd70ce6170d77d802b42
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a critical severity heuristic. Static analysis identified it as a PDF link farm containing numerous external URLs, many hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous distinct hosts with few links per host, a common tactic for evading detection and distributing malicious content. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

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://yesilkoyluleriz.biz/resimler/files/pimekulodev.pdf In PDF document text
    • https://cardolf.ro/files/38646055936.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/58139823406.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/tazaxofik.pdfIn PDF document text
    • http://isvpro.com/custom/files/zanonutejaberebufirafi.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/vazimobije.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59499bfa66b8ddcf9541562e47eaa16c/sarozotovezutijalufu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/86482542136.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/rexavafunezate.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/75265806435.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/jizawikepavezivenuzefopax.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///65643818747.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/45579007198.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wakadufefivede.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/66366268965.pdfIn PDF document text
    • http://hzqzg.com/d/files/95403697158.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16159ab93a2dea---58823695610.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/37553033511.pdfIn PDF document text
    • http://mobiliteit.nu/files/16014330565.pdfIn PDF document text
    • http://ping-property.com/user_img/files/83730896090.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/gorilir.pdfIn PDF document text
    • http://sro52.ru/uploads/files/71359088003.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/rinamefivokob.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///wuxutaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=steamy+historical+romance+moviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 19332 bytes
SHA-256: fd7988f994a9c39ed973f6d2e5900ba99b98445b71183f668786014399f926ad

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