Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f8d1f64b84884b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 08:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5e7b58d1a72f8a9a4964451795498da SHA-1: e48e0c9a1704124cc2b26652c90cdc73f26f7873 SHA-256: d1f8d1f64b84884b16657a6785edff13d9c94af75cda733138bd8e32d37a3c92
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 malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://underworldgear.com/upload/users/files/29301005208.pdf In PDF document text
    • http://khiensa.com/UserFiles/File/86736541984.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/jevot.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/42403291155.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/94025514844.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/82548547949.pdfIn PDF document text
    • https://suncables.co/images/file/sufapipujawusip.pdfIn PDF document text
    • http://vanhacollection.com/images/files/rupipebalove.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nikemudojudugamalubevifed.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/10320837595.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/2192767750.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ce85205f---23999909228.pdfIn PDF document text
    • https://atiksigorta.com/files/kerosoxora.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/42081697446.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/godinopepavowimivazugiri.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xodirobutegesuzigup.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/49734880771.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/sozis.pdfIn PDF document text
    • http://scpt.it/userfiles/files/pigowapimajegejul.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/kobokikosop.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/94811600699.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/54716827388.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29db59157---riwitemakakegijubonu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/lazukuvujuwivijof.pdfIn PDF document text
    • https://ambalatender.com/upload/files/loraxiwogivawazosisawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+d%26d+5e+character+creatorPDF 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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 18860 bytes
SHA-256: c7f940ab28cff29c9857f8ff6bffbae81db4549854d7d17cce88fcdd8dd0af25
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 9668 bytes
SHA-256: 69fa48ac72106a398ec168196a1e89b9dbe233b7c807859eb8c031a85359ce44
font_02_sfnt_off00013341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1