Malicious PDF — malware analysis report

Static analysis result for SHA-256 4154047bcf8514bb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 16:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e27575fd768a55f9075cd9fadf55bde SHA-1: 611f9b01946056c86cfbee84629122de8a9650c6 SHA-256: 4154047bcf8514bb503ac96d32bab5c1be7e93f4a4e878aab7ffc7a7fa51be31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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 http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/11401948412.pdf In PDF document text
    • https://nabijdefossa.nl/upload/files/35961983014.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mijibu.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/62353806990.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/34281560119.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/15992811108.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vuwalakotozudex.pdfIn PDF document text
    • https://vientangluc.com/upload/files/jegazoximofidawupuva.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47755728198.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/sevodajurinijotedesokeme.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/9619578449.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/57290109626.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/99332607886.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/50369059344.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/73390944320.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/89004504645.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/gosuvewafefetoxumukirova.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/44487000149.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/29245264938.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/85536234189.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/waginoro.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/tesipon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=blue+ocean+pdfPDF 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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10308 bytes
SHA-256: 27b288cf9069a8f31df9dd490fd9d2352632d15f6a102d18c38c8b265007572d
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 17512 bytes
SHA-256: d5edd92d977993338b33d59ab72024d03f93acf1d6f6e6b4602f3669360455c3

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