Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e11f8cb599666e2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 17:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b3031aeb5af93c4a380678979964a34 SHA-1: e21e044eca804fcf6ccfc2eeb928ec466716babe SHA-256: 8e11f8cb599666e231b32508dcbac44aeb7e09743c02c4bb0b4ffb46a4f64f55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully detailed, further supports the potential for malicious actions such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=technical+report+writing+course+pdf PDF link annotation
    • http://bakersfield.thepokeluau.com/uploads/files/tugarisurekivuwija.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/4863550147.pdfIn PDF document text
    • http://hidramaco.com/files/files/mokejatoviduzigaguzen.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/34006832328.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/9894429128.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/34459269215.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/54889646794.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840b1335f7---menebelezusitig.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/43465278980.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/koxizeloniw.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/9172494644.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sopiruzunonerotimam.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/14889395153.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/50605764491.pdfIn PDF document text
    • http://3q1p.com/upload/file/210901054928918252lp0trki0gfip.pdfIn PDF document text
    • http://zgic.ru/!upload/files/kalumik.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/pagotekibotoderoxib.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/18505865565.pdfIn PDF document text
    • https://aneri12.eu/res/file/wepix.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/25015940201.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/zedekosenutegagalinobizu.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pezuru.pdfIn PDF document text
    • https://coil.hk/upload/files/7755074639.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/9643527218.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/45684472396.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16732 bytes
SHA-256: 8e4ea981657e15590865a5133fb61825b7fe567bc9c25d3f13b051f2f7fa251d
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 11048 bytes
SHA-256: d20719409833ed47d4a34efc2195ff71c9f6576fcb7aab00c82b4eaef28a3c98
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1