Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f90283de91b156e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-22 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ce7f36de20e47e6a3c9a4e5d81d3a28 SHA-1: 6e0cc34838d17b1bb859cf3bc425ed697a65275b SHA-256: 7f90283de91b156e8c88001db7ee5fc5f958ff58e095d3716ca59fe327f852a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://krisoc.ru/uplcv?utm_term=somewhere+in+time+movie+full PDF link annotation
    • https://kentacademymiango.com/userfiles/file/40200731166.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/tonowutalilaporegode.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/39133375254.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/41534996557.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/lowutog.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/xirazewanapiwomavu.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///79279413751.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/bowisavonivafi.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/80103756200.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/34972983976.pdfIn PDF document text
    • http://4darchitecture.org/img/all/naxezaxege.pdfIn PDF document text
    • http://kag.fr/userfiles/file/91866671677.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161495c519f41b---joloterorizuvejidobogok.pdfIn PDF document text
    • https://wasael.com/userfiles/file/90890468783.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/robefojujavad.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/xemasofaxufu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xanipe.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/vogixigifumexanani.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/5162653313.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/nikukuwapojoworef.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/27f37fc92987b756cc3311f59800bb81/46694095135.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/17598615516.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/72854398028.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/66885192834.pdfIn PDF document text
    • https://agrando.cz/files/file/rogomobanupilozepebip.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_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_02_sfnt_off00014762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14762 10476 bytes
SHA-256: d62595665f171f239eb4ee4c50e93e8787a0f97c5604f0bc5744a4b2ed5d0a15

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