Malicious PDF — malware analysis report

Static analysis result for SHA-256 3485843818a4c454…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 17:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41bb99fd3ec5f6c3a80e1d9dba5eb9ad SHA-1: ebc25549d5d513246e8b824211c332fc7a36b41e SHA-256: 3485843818a4c45428bce4b1011bfc9a3d6ddf15a41125644365756dad005f58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://anna-bel.com/app/webroot/files/userfiles/files/zuluwalupevo.pdf In PDF document text
    • http://majortaylorride.info/images/uploaded/file/xepejinuvinuliwizumogaja.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bvb4i4vpj161n49qi2ka7sl9ns/fosubijumex.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/13103922371.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/83203360853.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/40023795382.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/79969547483.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/rawimenuwuporebasiwaze.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nogogorufetulotirog.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/34267603269.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/60307473021.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/67761527562.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/xujemaxojunulopalajuf.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/68620431316.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/sukogovanudilev.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/29009848188.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/tamanisejuzavules.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/memawifurogedopulo.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kanedojorekovaridom.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/lizafibizegofeb.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/72498675753.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/14374163248.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/39733074289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+gallery+onedrivePDF 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_off0000cc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 10320 bytes
SHA-256: d8aba3be60e6d01e944a9822c473504d837619655a8560321142308050e94c17
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 17176 bytes
SHA-256: 24aab0aea2ea18098c8e1c99731eb927146529b8070a3330db0e032922e69dc5

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