Malicious PDF — malware analysis report

Static analysis result for SHA-256 193de3f18ea42845…

MALICIOUS

PDF

69.7 KB Created: 2021-03-17 09:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5539d55890b89f233a4ef053e590c4a SHA-1: a43297168fea690de3b0076adfea01cc21ac29a0 SHA-256: 193de3f18ea428459bfb802dd95acf931fad82d0f873fb9d51b90840c2ba44b2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm designed to redirect users to numerous other PDF files hosted on disposable domains. The embedded URLs and the PDF structure strongly suggest an attempt to distribute further malicious content or conduct phishing operations. No scripts were extracted, but the overall pattern indicates a malicious document likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://dugedepap.ru/strik?utm_term=centrifugal+pump+handbook+sulzer+pdf PDF link annotation
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/pazefalix.pdfIn PDF document text
    • https://dixamagajo.weebly.com/uploads/1/3/4/6/134652312/ef8f57c134a67.pdfIn PDF document text
    • http://arendaavto.taxi/jituwofijovujezifurinoluh1zeu.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/ziwexewaxekus_sexoxifolomi_nenutaselof.pdfIn PDF document text
    • http://itprod.space/environment_impact_assessment_notes6o77o.pdfIn PDF document text
    • http://fruittea.space/jefofagawa2q7jc.pdfIn PDF document text
    • http://creditstar-kabinet.com/maintenance_ez_go_golf_cart40n88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_6037957f1021b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385030/normal_5ff0b3acd62d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6018ce169e1dd.pdfIn PDF document text
    • http://devgm.design/what_is_sociology_of_education_ppt6emw4.pdfIn PDF document text
    • https://cdn.sqhk.co/perolurowona/YHghjaJ/ncert_books_and_solutions_app_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hfwRjhD/zamovomuso.pdfIn PDF document text
    • https://gufubavofunopi.weebly.com/uploads/1/3/4/7/134704705/00cac2b4eb4f3.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/xupop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegorabeg.atwebpages.com/1630962305.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_a2eb6ac868204acc9a6b7413edccba4c.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/changing_fuel_filter_mercury_150_efi.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_c42619080e7d459a90b87d4fced86637.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 5616 bytes
SHA-256: fdba3add7d71071663d6e1fe6e02d937cc8dd3357097b672fa13bb8a3b2338cf
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 12668 bytes
SHA-256: fdd20a692c3ddfa6e839b201201705bddb9a0587d78bb6f013f17dd0a1a9da2d

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