Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c0a353fb5d4f0c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 22:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 851e7e45915f974e4bb3fe3550174c65 SHA-1: 23ee5966e67c1e8524f4b7dcbd0eb8c243561ab9 SHA-256: 31c0a353fb5d4f0c7a79056168da2f8481ff1a015c72a7e44d0e0edf815178e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or follow SEO patterns, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://leonvi.ru/award?keyword=calibre+guide+pdf
    • https://fizubuvi.weebly.com/uploads/1/3/5/3/135301632/sewubufezetaxuvexi.pdf
    • https://cdn-cms.f-static.net/uploads/4403259/normal_6051c4ba88731.pdf
    • http://wgathering.org/the_art_of_unit_testing_deutsche_ausgabeoxx3e.pdf
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/2436418.pdf
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/demomurikulipagosob.pdf
    • http://pedron.fun/2003_kawasaki_mule_550_manualbkhru.pdf
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5ff84882a1391.pdf
    • http://zoxodur.sportsontheweb.net/46522509569.pdf
    • http://xitnet.fun/arp_4754_free7yahv.pdf
    • https://tapuwapefozex.weebly.com/uploads/1/3/4/3/134350869/zaxiwidafi_nawamot_wuzunejufavo.pdf
    • http://oblakova.ru/kirofavikakomavth.pdf
    • http://zememor.sportsontheweb.net/barnett_vortex_lite_youth_compound_bow.pdf
    • http://bhd-management.space/4331195324bfjuo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_7fb135e4c6ec43cb894f8fcf8adeb692.pdf?index=true
    • http://birukuf.onlinewebshop.net/lelatusokibuvulo.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_116ec7c2e1f748dbbbecc3551dc80015.pdf?index=true
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_2fabe9200f124b30b9ae84250294bd50.pdf?index=true
    • http://lojabupabavize.onlinewebshop.net/jinekigovibeg.pdf
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_9787d1348c41445ea07a9be336aae17e.pdf?index=true
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_f27082b672d84429920545e9ac1dc488.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_off0000ef40.bin
4500756e47518d7792facc25cc70f2e1ac771703ec16e819b3fde2403fc6707f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5076 bytes
font_01_sfnt_off0001008b.bin
4aea94e96107c1f3d08f8eff57575244e5e51d91e12836773dd8e191cd76a682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10516 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.