Malicious PDF — malware analysis report

Static analysis result for SHA-256 2648fe53574cd65d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 13:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dc6bda4559302730f4046412de4c5319 SHA-1: 42db3849025ff1e8c89afa64759d23040a18a768 SHA-256: 2648fe53574cd65dd9177af3baf48f418b51699a76bad7aecbfe0e88bb49ecf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to lead the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/47786838631.pdf In PDF document text
    • https://bunianco.com/other_files/File/62064422052.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/3934591293.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/pegerixodajijudopi.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/54312671000.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/vovokipogilakapolowixu.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/numudawi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/72587839232.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/jegipudulewudixojazogif.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/sotekupowiduvutejofesel.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/74583964139.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/28291401786.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210924140016637513v26fy.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/xenasigisadapepivusage.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/36277357437.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/nubolevufuti.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/roxekokapikuwotegawewomed.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/98302842651.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/deperi.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/42633671679.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/vazedotijigudesomovu.pdfIn PDF document text
    • http://travellerisland.com/files/nevelajoveniwegom.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/kesugawukawebaviwovij.pdfIn PDF document text
    • http://grafitym.kz/files/file/95646284989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=real+fake+credit+cardPDF 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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 16872 bytes
SHA-256: c2553920261a4a6953bf9043afb9fdee8a95a4394069173f66fab1b0245cb34b
font_02_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10212 bytes
SHA-256: c2d3c53900db86fc9e4c7be03a90130f5c0d76581084a72288bec92536cb9cd2