Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7ec4b7ea393539…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd8168b6cb1890217f2cd62bb654c250 SHA-1: 77d2fde062d3172adb35394b45201d49697b1995 SHA-256: 2a7ec4b7ea393539d4e40c76a64a7a9f9920351ce9b0ee61709630a617269a63
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 on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=watch+bad+boys+for+life+2020+online PDF link annotation
    • http://proficlim.ru/public/userfiles/file/fitobemipuvutopuduzup.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/tokatupalalunaba.pdfIn PDF document text
    • http://fygl.net/uploads/file/230202431101.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/notosabumope.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/susulenabakinovamevagev.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/puwejavorokimi.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/26903461800.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kijodafiwejeluvujutiziv.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/lupezudasamajiveti.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/48329878189.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/58200258190.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/26529260886.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/51693403714.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210930182318.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tulofifepal.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/mavowon.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210921093714.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db02df27f1---79834055579.pdfIn PDF document text
    • http://cold.lt/userfiles/file/novekenirupowegigelita.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/26142292735.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/12414915435.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/14731695122.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/23480827887.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/vujidazodejajijabuwax.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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 15484 bytes
SHA-256: 46efe5ee30f3ce3944dcdbfc9577ff5c2be3506c12235d6d4c1d82d53cacbad4
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 11064 bytes
SHA-256: cdc65a89e54462878a153d62f1bb10da172ead5d5d135836e334a6fe9c6e21da