Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae56b97d617884a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-29 10:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37855d6044cd17ec5ae48849c95e8d9e SHA-1: 6cdd6a07d67007c37b5abe1ed2ddce321ddbd4cd SHA-256: 9ae56b97d617884a879b05be88e09ba206be7b44c6771e386eed1ff4e49efd0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://factblogs.com/uploaded_files/userfiles/files/3276605942.pdf In PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/nizizikowevixagalipo.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210926151459.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/87209508622.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/pujabovifusowozuxatufudi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efafdc0d02---9382771777.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/75090356581.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/62793757802.pdfIn PDF document text
    • https://inarsindbari.org/uploads/naledutuxirakej.pdfIn PDF document text
    • http://badgerhillfarm.uk/febolarafujerel.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/vazilewemofizuzo.pdfIn PDF document text
    • http://trovas.com/userimages/44676469532.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/60554590112.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kumurawebatabuwu.pdfIn PDF document text
    • https://angem.fr/userfiles/file/44052084908.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mobinarogugowina.pdfIn PDF document text
    • http://lactopad.com/uploads/files/nisaboj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f920e352abc7d209812c50482741359b/54573971480.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/retotakawibezuk.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/wazitadubigasetoduxiber.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/24482604499.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/xowisuk.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/77589273753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=como+puedo+imprimir+documentos+desde+mi+celularPDF 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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 18172 bytes
SHA-256: 60ad767540de30a612d2614420fe33d7b9dc82c8d74ec78b039c96cef776a39a
font_02_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10804 bytes
SHA-256: 1fd892de0c8155e4257f5d221e20d7352695a85a75cc3c1d2518535ae51a1e55