Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa55dd1a464448f5…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 20:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d311be62cba5f86af2869680b6ea5fb9 SHA-1: 936c9bc29ae8713fdcddc60e17a505df7a43a84b SHA-256: fa55dd1a464448f5c8520ddfdb8fc28d946d0b1e36a274976f1718e1bb652064
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://clap-bas.com/userfiles/file/zulelepitabutelegubediko.pdf In PDF document text
    • https://dadrarad.ro/userfiles/file/kugevubemis.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/dafesel.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/jamepujejowowasifu.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/79737273707.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/17964547174.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/82105601488.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615178e3602eb---nimaxalobeniwipiwofoxavi.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/27865889670.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210917031528.pdfIn PDF document text
    • https://medtek.vn/storage/file/xiranenilasi.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/fusotetod.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/df3700d627fa807f31a86f602ea8e48a/migigogolilekivegafevab.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/51987093443.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/97394887333.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nuxawunidapowizejeratun.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/butabakevorafuxawezij.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/xafiporonuxer.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/75224640821.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/dakemepuverupivux.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/14587164012.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/96961901105.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210903/file/34303470066.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/94797567541.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/durak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fundamentals+of+futures+and+options+markets+9th+edition+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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 14568 bytes
SHA-256: da7188c710fb0f76a7b235fd62027f580f397fb857df07d5448823bb80f8e6f2
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 11100 bytes
SHA-256: 2c4417b52249922db38f3fa54c05db60d3e7386c120863e0aa82d447f16a18fb
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1