Malicious PDF — malware analysis report

Static analysis result for SHA-256 2538f09bd35bfc70…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 10:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb14f135ef3bda341ebaf27114ad9393 SHA-1: c8b2607692e6c54aa6235d2d74ae8aea587080c6 SHA-256: 2538f09bd35bfc707c71a6636ecb0e96ca9b56d9e9b7cc4c87b5a982cf1a57bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=can+you+recover+deleted+call+history+on+android PDF link annotation
    • http://baocaosuhoatoc.com/luutru/files/7207555943.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/51274799031.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/83488681956.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/toq66mit2vnvhip0gt6g1i6mdh/34071838716.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/kotofufijisasosulijejo.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/vibikixexexadugetav.pdfIn PDF document text
    • http://elpijisystem.com/file/jipisifatiwepubefo.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/78075688026.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/kemizududijewozorafutoxub.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/92918360108.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/vuwamigapaxituj.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/40196701794.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366794b455c---wuwuzafejesu.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/litojotuzudesobozefi.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/4087521909.pdfIn PDF document text
    • http://redactron.com/userfiles/file/duvunokidogakolasegage.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/22965889930.pdfIn PDF document text
    • https://cubic.is/userfiles/file/38155678005.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/39975660358.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/33908114991.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vivelifupesujevumivinev.pdfIn PDF document text
    • http://www.moyekolodin.com/files/siparereban.pdfIn PDF document text
    • http://freeski.hu/freeski/file/totolizalapagigawizo.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/fuvefok.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_off0000b2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2ED 10780 bytes
SHA-256: c63c1e6714c169d41f91e7a297307e8898dd1b3dfb46138e36c2283974df9291
font_01_sfnt_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 14756 bytes
SHA-256: da56360137a759b4bfabc4865818ea7e6f01b1a2356571d18e3c5305c4344bf8

Open this report in the interactive analyzer, or submit your own file for analysis.