Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c7f253cac8a6cc…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 20:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf6443b584b8efe50fb9e1024c8ce8c2 SHA-1: ebbfa716d115c9ac7e0db37d9793efb0671597c6 SHA-256: 93c7f253cac8a6ccdad70679b9352f13d9edf7b0aa1f3168e2367e69f8e75ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, with one being a known benign URL, but the overall pattern suggests these are used to funnel victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=relampago+del+cielo
    • https://cdn.sqhk.co/letijefa/Bx7hcay/buxakukemuda.pdf
    • https://cdn.sqhk.co/wefadegese/iGysdMs/realistic_shaders_mod_apkpure.pdf
    • https://cdn.sqhk.co/jenetuwuda/5QJgc60/vadefufixagunonakajob.pdf
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/1889102.pdf
    • https://cdn.sqhk.co/fafovewidom/ifgg3mT/neogeo_mini_console_red.pdf
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/zebesoga-puzosax-motelifeb-fifujewapes.pdf
    • http://vagoneviwesum.66ghz.com/4657967860.pdf
    • https://cdn.sqhk.co/dijogiper/ihNjfic/456118965.pdf
    • http://wiwajekirutiw.scienceontheweb.net/3071484094.pdf
    • http://pumorux.medianewsonline.com/bakavawameramesulusun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilepobafomunow.atwebpages.com/60003441458.pdf
    • http://fowasabitafal.epizy.com/midemowuvuzibevolugugin.pdf
    • http://kimawawasero.onlinewebshop.net/what_is_measurement_methodology.pdf
    • http://nujuxat.epizy.com/hotpoint_ariston_dishwasher_manual.pdf
    • http://fukutinupamebo.rf.gd/animation_cartoon_wallpaper.pdf
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_8438058269e6471b951bb08ec76928b1.pdf?index=true
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_32778bec439a462dbc64ea128000298b.pdf?index=true
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_161b743d36a84447942695bc036394a7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee68.bin
854986f9dbea4a19f292b4ecc8ef7e1d89b95471b6bd018f52cc3e3dffdf89de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5124 bytes
font_01_sfnt_off0000ffcf.bin
7aae037fa47074a84910f5fd7e64f9b8739a77b57d3f5ea5e99fa711609b0584		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 11824 bytes

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