Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fae86c9d13dcef…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 19:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d363b7ca54214eb983b6a7c89a09b013 SHA-1: 96ecb6e475e0b1b9ae3198b53c3555c8aabb806f SHA-256: 75fae86c9d13dcef118e154e573b54af1422226653042baacc30e96a26ecb51c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=advanced+macroeconomics+david+romer+5th+edition+pdf PDF link annotation
    • http://tamtamphat.com/upload/files/fevufepalubixeferezaputav.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f0c099fb---bagojikobidawudepokamope.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/82006117796.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/lalukezotudulujejed.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/saxifozimabolorajaxe.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95593643714.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/bevupadalowipobibimajewe.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109081927592043.pdfIn PDF document text
    • http://12shio5.com/contents/files/jefopatewoxeru.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/50a1e2d5ac520e90bb497fe9c178ab8d/manugupuwibowovupajun.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sufoxev.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/wegowuvob.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/62388804627.pdfIn PDF document text
    • http://adice-area.com/pictures/files/69881174813.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/xudunedavomomekezanuxow.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/folaki.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/gavekarijuxavuxexukolazer.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/jibesutexedas.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pofaz.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/39213441261.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zokajesezig.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_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 11020 bytes
SHA-256: 208f715cc35f83e1de2f9f2eddb41bc2c91560763839e9a3aef7f8dc08a1ba83
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 17704 bytes
SHA-256: c06ddd1eac1c8e774d4b7e0e103b47564da705ad1b74229645a166072a6f0da6