Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e3e27c39c68972…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 56f21937995b62002483c3a5ec863399 SHA-1: 545607e9e7e38f920c7f477f98d04336135be668 SHA-256: f9e3e27c39c689728ca1107940089b1fe0fca2d86ce2196379a0edc2ce709c66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=hero+wars+apk+mod+2021 PDF link annotation
    • http://digitalpolicycouncil.org/imagenes/file/bagugesosugu.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/mepave.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/majuvominasub.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/wadopisarazevuxegalud.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/miluvapiwut.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/bizuparopofiruwetuv.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/33793547137.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/38057882650.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/38834775354.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/davozafexurumekominuzino.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/25107925732.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dumopoxivedajotaxaputo.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/75981999282.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614beb9fad42b---61104300482.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/liwetajozesoduw.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/vukefetuzujarojeno.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/45922516118.pdfIn PDF document text
    • https://dom-titan.rs/files/89317624029.pdfIn PDF document text
    • https://kildevangen.dk/files/49450898938.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/54864929840.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/75923994165.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dbf3929f561c1ee1d991b711249336db/49166989848.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/resinuwopevib.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_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 10676 bytes
SHA-256: df55e4b6c0b39af7842f948831a93bf45f5e5895e16ed15e5612d3cd476e3294
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 18804 bytes
SHA-256: 43ba7efe9d1aef1e87f79ddee30f78f9ea57ca1eaf0bc3a48b0ff033f48e6b90

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