Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9857ea37c5d18a…

MALICIOUS

PDF

89.2 KB Created: 2021-09-20 08:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28bf22ddfb98bdd4237811762cd797bc SHA-1: f176a36341421e0b91cb78f061dff00fd6254e41 SHA-256: 0c9857ea37c5d18aed8e2b9f87eeb7721a9a0ddfb91d5350e85cd439d8f378c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://redemaisfarma.com/userfiles/file/58827610848.pdf In PDF document text
    • https://tims.ro/ckfinder/userfiles/files/66901362697.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lugotalovejizimedaw.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/pifokitodosotoxem.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/34993033773.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/wesogolepulonodoko.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091009364646.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/81633020636.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/genodutiridotilibux.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135020474fbc---73005953604.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/48777102733.pdfIn PDF document text
    • http://dfanchem.com/upload/files/84469058559.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zuferonuxawakekugavopajaz.pdfIn PDF document text
    • http://briztravel.com/upload/files/pajavitiboxefozulawom.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/zoxivojalire.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/52456328156.pdfIn PDF document text
    • http://vejwun.cz/images/90426517369.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/lasujorafezifugaxotod.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/77109107734.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pozusalutow.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/pijaxisaxepesofazekenexo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/takatolebag.pdfIn PDF document text
    • https://premium-house.uz/images/file/37737306599.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e4lo6fnb9th3llojhanutikn04/wagagogima.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/84849593387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=photo+share+app+androidPDF 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_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 17816 bytes
SHA-256: 29a6fd06b130cfe68eb199e85e13975d3b9983ee1442fe954b774ff001c756f7
font_01_sfnt_off00012716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 10444 bytes
SHA-256: 48e84bdda7ca96c65726db9e2af7d6a3d4e1e1e97b89764a78306800cc7b01f9