Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fd6f6a6fb5dd3e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 01:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92403e356a2fd085186715915755f2fd SHA-1: a37637940d0468ef3202e498601d051c9a66e8ac SHA-256: a8fd6f6a6fb5dd3ec692c04762e7d799999474401f3bc9130ef9d627d06576fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://acrgroup.nl/userfiles/file/gizevovikiwuto.pdf In PDF document text
    • https://mkart.it/uploads/file/29405522626.pdfIn PDF document text
    • https://tepihtrava.rs/files/16829705390.pdfIn PDF document text
    • http://micruts.org/userfiles/file/6844934406.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161373fa56972d---tofurelapi.pdfIn PDF document text
    • http://scsychem.com/upload/files/sovosekefovanebazobalinal.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/fawudatadoronifogigurof.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109050446539326.pdfIn PDF document text
    • http://primaneighbors.com/userimages/5800135085.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/70c51d4d6e089c1bc3a176b40104a81c/88573844539.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zofuzivixus.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/fewokuzukosisumok.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/25053657376.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/42250518086.pdfIn PDF document text
    • https://norservis.com/files/files/93225659765.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/29401656.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/xapanufemurije.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/guvinawuvazotefedifikada.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/91369264542.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163082141292.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/42692189624.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210907033742701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=difference+between+tablet+and+computerPDF 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_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 10940 bytes
SHA-256: f5db6e4d850ab52f6260c30d240533922833aaf1f19b611f6574173de6b87a9b
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 17892 bytes
SHA-256: ebcbca5d8c53868d69d80e90843fcba802b1a7be8b6e70ebbfb86c150dc6341f

Open this report in the interactive analyzer, or submit your own file for analysis.