Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d71abf501b7395c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 23:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 266e83f5cc22c57d4d76b1f797a8e148 SHA-1: a3dde5ae6a97c61b65dd6a5d7dad562881ae6301 SHA-256: 5d71abf501b7395ccafbfe281d54c854ed6fca9db5644f5ac44b01d85d3eae18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://friend5190.xyz/js/ckfinder/userfiles/files/7088611107.pdf In PDF document text
    • http://ebus.cn/up_file/file/10265686745.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/93042654897.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/gaworare.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/maravim.pdfIn PDF document text
    • http://laduses.nl/image/file/57494884919.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55054911066.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/sumobimoba.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/57465315925.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/64346936813.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/pinelatebaxowanakemutora.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/61019897572.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/86468552009.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/bobedinitebugub.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hvec41hor16bbrgu9m1kaj6pb5/jerolifosinoses.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd1a0c2dc---xesefokiparinivizazoz.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/fovuba.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/54456761458.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/16732380034.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/nokudabivopitegodilimi.pdfIn PDF document text
    • http://laserinnsbruck.com/static/gugafixuk.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/65268936676.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/mufudoroditipududufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=damonps2+pro+downloadPDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 17556 bytes
SHA-256: 85414425962c25e9301c11ef20687d44052f1a2c143f1c8d5cea7b41efe3c18a
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 10440 bytes
SHA-256: 3127ff8a1bc144355ccacb674932eb7d5d468d1aabbbfb18d05f45e86829c3dd

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