Malicious PDF — malware analysis report

Static analysis result for SHA-256 814f3e67804044b6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-12 12:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf9486bab1ab722c00cd4fec8ec94170 SHA-1: ff2cdbca8c255412823e24ca0d3d8f6acb301382 SHA-256: 814f3e67804044b6d129365c841101cfb6990e32aecc73710222f68a2f38e9dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, and a high ML score combined with ClamAV detection indicates malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=hack+pubg+mobile+android PDF link annotation
    • https://www.ftha.org/admin/ckfinder/userfiles/files/funoverob.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/62775563864.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/gusitepovidu.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///71304618327.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/79c3186314900239545838a93286c078/dawefiwo.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57673339061.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/manefetoxil.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613811cfb5311---15141600955.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/14596769423.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/bamugotopogugolix.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/14782327955.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161309e401beb9---lagegufupoxelavodotupolu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/72754265580.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/88042119786.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/95030523929.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/34910819588.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/furavizokenedugalo.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/megibofadiniwutupese.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/56667092434.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/mosoxezumixoko.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/neburilimipagared.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/32276396200.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/25956865603.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/98766287760.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_off0000b891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB891 17088 bytes
SHA-256: 0ee6d0e1786189b1551f21b43b076712d714a4ba7b1c6aaf074b85fd3dffc1e2
font_01_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 10916 bytes
SHA-256: da81a5a433ef58f64ffc648301c19e3d06721fddb80dd8eaa63f889e2b6447ec
font_02_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1