Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d7e563e5202a90…

MALICIOUS

PDF

74.2 KB Created: 2021-09-23 21:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ec7ffc96d0545d35f90809b3332e5f0 SHA-1: fee7dedb6ad93d95e0790c8e547bd349b44f0f69 SHA-256: e1d7e563e5202a907e05e2efc37d800954275d489502dcba7c76961deb7e7c72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=gta+san+andreas+apk+obb+latest PDF link annotation
    • http://pokwuttibut.com/file_media/file_image/file/11756583032.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/bovavinuvorejigoja.pdfIn PDF document text
    • http://stefani.cz/fck/file/medoj.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomenukiwokevusipazunafow.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/57338108452.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/wofugedafatuwaf.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pefideloba.pdfIn PDF document text
    • http://markone-tools.com/upload/files/81971943697.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139a0ee936b6---18073367844.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/32976814117.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/temisegomelaj.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/86406133772.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/42563768841.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/97698365870.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/paturanez.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/7921441329.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/81151245273.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109050851535502.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/5653264684.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/42461619110.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/delavone.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/sadazetoboju.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rizaxemososularun.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/teratoxukawuweriwomexopep.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/22592349815.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_off0000be9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9F 17044 bytes
SHA-256: b1d18c9484d99cdc59e8bb5e23f9ca4de09f41ed4cdff855a08a03812c03bff8
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 10564 bytes
SHA-256: 164d59dd79e8bf014104d5078e806f53e82f72fb690cb845336fbfe5373facf4