Malicious PDF — malware analysis report

Static analysis result for SHA-256 b132093994ac2e02…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 09:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 011ee6c0fa20e9b0766610e89058e1af SHA-1: dfda4f21364c29a7971eef16c1adef1d635da094 SHA-256: b132093994ac2e024e38c90cba6a059ef77f543321db544d187fa7e84aa3f2f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is designed to redirect users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=eggs+high+in+purines PDF link annotation
    • https://protradingindia.net/userfiles/file/47987540332.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/fubusabagabadobabulegi.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/69014293974.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/belamuwisibigo.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bapipatemabewarokataru.pdfIn PDF document text
    • http://kondicionery-bronnitsy.ru/upload_picture/file/3425752737.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/vixebonutebuwizajon.pdfIn PDF document text
    • http://iscelenie.info/files/file/48251058505.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/tidulorelopasumabubep.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/viramumepewezubexixejovu.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/7780888782.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/38421377574.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20211001021031.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/85751278746.pdfIn PDF document text
    • https://invision.buzyhub.com/files/90486836991.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/silowukogajeruwimuba.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/ledodapiwimanaxop.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/08fjaas0npugrbve15a02kbdsr/fujuxoxelinevugus.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/60877960985.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dugeperebap.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/38315157776.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kld5hvl744rpao6nr9knjt1gcv/pinirasafafonidilubuv.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_off0000b283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA95 16636 bytes
SHA-256: 4def261a623d35be8969c77c231cb57ae85b3abd05689180b397220fced09433
font_02_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10188 bytes
SHA-256: d7ad189fac44090800ac6ef757110367f0d7406f734e786ab4c50630ab0f2171

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