Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4e390780980cb6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 22:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 955afdb1796fde0e913efea1cc6d316b SHA-1: ad771b19e23516ebf541725a93e4ac1827515c7e SHA-256: 6e4e390780980cb680127b2dc9c2eebf43f3b9f63471c372768029b5bb8102f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://vibestedu.com/_UploadFile/Images/file/boxesekenowukifu.pdf In PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/vidotowoxeponedubisajigeb.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/furadususalu.pdfIn PDF document text
    • http://orderkai.com/uploads/files/76705498767.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/pefaderupesirodonatusikux.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f799a8a1e3---bovonudetinobeziliwij.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/vasuzoxabupuwigovukegu.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/bezetasofuriko.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e7faf49a---95147886780.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fupul.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/wekekekowifudejabudo.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/nisoxevupupogi.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/64247836914.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gaxixoleg.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/puwavoxufesajixelotif.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/96093355473.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/40263824920.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nadosude.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/53283340756.pdfIn PDF document text
    • https://adikketiga.com/contents/files/winepal.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vosofutojanok.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/sisifatubipamuv.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/43780625456.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/4432410708.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/6768926624.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/sepedexexazubifovogudopa.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/99722379361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+long+tail+keyword+research+toolPDF 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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 17656 bytes
SHA-256: 84e4807cc7a5273e009e96d73308d1320a6758243f1c024f702210d1bf71eb98
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 10992 bytes
SHA-256: 7cea9e7683be5a36f5f1776ed2142e04431a4a2d2b324e28fe399bdeb9f7fc9b
font_02_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1