Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d5b90120151931…

MALICIOUS

PDF

96.3 KB Created: 2021-09-19 15:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d25f56984d406c304bf95c3415ed16c SHA-1: c009c7a687a4281bbab36af339cca20c33c82c6e SHA-256: b2d5b9012015193174450dce03063f204a7a291302b73137beaf7509cb8824d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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
  • 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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613647d112e4a---nimulotafabotuboneza.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395252cbcf6---xukirilodidavex.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/84883288251.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wofolonimezaf.pdfIn PDF document text
    • http://wronba.pl/uploads/wysiwyg/file/83976092193.pdfIn PDF document text
    • http://prosquash.by/data/37010251450.pdfIn PDF document text
    • https://rubfila.in/files/file/pafenonojikem.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/91612430773.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/37814735395.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/lirupujesokiwosarepex.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bekagolepowa.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/zemijigifug.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/polamanajolewex.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/79055980863.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kotinulajubo.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/kedafaj.pdfIn PDF document text
    • http://strahyi.ru/images/file/52582333025.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/zujisuraneberoriwuj.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/rokavatif.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/tinofojo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sofavuduvofujukadugapi.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/6810221026.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109140650122298.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/noniwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=arcore+measure+distancePDF link annotation
    • 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_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 10564 bytes
SHA-256: 11b74b37eecb3128b473392b17f331a761daa7a3e8b1556a83547b02c509d822
font_01_sfnt_off00012a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 18804 bytes
SHA-256: 190300751d88f5e019ac04bd286a1d068c999eba232ade7356501cdd8ee90b15
font_02_sfnt_off00015b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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