Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf9b2fca2b9851b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad4e0a88d02c6bc3a9700ef33bc374a5 SHA-1: 930779806d2974cf34e38abb182bcce0178ec8d3 SHA-256: edf9b2fca2b9851be867f84d864b40173840fadfcbacf3f695be433837461fcf
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on unknown domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://porpora.eu/imagenes/imagenes_contenidos///78994876538.pdf In PDF document text
    • https://berbagiangka.com/contents/files/ridotijow.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/77282246319.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/powoburekegigobokon.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vobezidelezesi.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/makakirupev.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/movuzapadezozo.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/41761670556.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/83572842594.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/liduxubigexasaveputago.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wisoxata.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/legazo.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/fasuborasa.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19636355998.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/vudulekozirar.pdfIn PDF document text
    • https://onlinendttraining.net/files/67466444008.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8566a7aefee618053c47019e98417f75/20732212842.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/buwelikinafisu.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/joroworidasazewuxe.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210913090708.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/nugutixovepenori.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/zowobisugulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kisner+ejercicio+terapeutico+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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10788 bytes
SHA-256: 5fe1175efc68a16a3e5fb929a1fddd83e7604e2d5139fed6c2822c589dd0b7f4
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 17544 bytes
SHA-256: 50cc1a95fb19bd9ca332ba1850e851bd20a20fb837a2886449f47b84e8c30aa5

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