Malicious PDF — malware analysis report

Static analysis result for SHA-256 202440cb1a55b4d1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 22:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49d1f387635a9e7007e96afaa28b7862 SHA-1: cf9c18dddb3cd3033953e32b8583e6945289f7c8 SHA-256: 202440cb1a55b4d11771dfd3f6aad6f10e7d9196cb66ef0ab84ad83b2c919341
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gaishachuukobuhin.com/js/upload/files/44366979422.pdf In PDF document text
    • https://congnghiepxd204.vn/upload/files/negijozav.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xizuvikofilosod.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/kiwosulalonowa.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/14741661282.pdfIn PDF document text
    • http://ativn.com/upload/file/14582146266.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/dunalibaxomukesokase.pdfIn PDF document text
    • https://ikima.fr/uploads/file/65742094120.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/bukirikajejulupevege.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/61355993584.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/rebubudujolitexuroguratad.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161332fc59fff8---9778763599.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/degorovo.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/97358700601.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/nuxujun.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/71269570414.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/veporaxirejesipobopuzab.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wubipulisugerejozadi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/zatum.pdfIn PDF document text
    • http://glttek.com/userfiles/file/tofupilaguvuluzuxagununas.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vemaxaku.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/60845739099.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/90732988142.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/zotitivelalomu.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/46825592090.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/metoneze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tubemate+download+2018+for+pcPDF 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_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 11312 bytes
SHA-256: b825d936d85a08c9ea4789806356f6b8c42e18101b9436ffd748fca015a7d886
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 17436 bytes
SHA-256: f27584242b4cd7f69b3759d8811655ffc005dd8c1a06c6edeec807ee02c7afdb