Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9f96e74a683352…

MALICIOUS

PDF

74.5 KB Created: 2021-03-18 20:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e44e8dd63e2af89ad4658eb9880367 SHA-1: b852f98e72230e6831c8fa8648925a07fd0a6591 SHA-256: bf9f96e74a6833521809e5fb52bd7b2952170acaa965c5eb50a9269b989f0fa4
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL points to a suspicious domain, likely intended to redirect users to a phishing or malware site. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to exploit users through deceptive 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://kuzutuzo.ru/strik?utm_term=tissot+touch+solar+connect
    • http://lixodamevurobar.mygamesonline.org/kunewekokovalugabuf.pdf
    • http://zejufixapoferu.iblogger.org/tibozutod.pdf
    • https://cdn.sqhk.co/geruxibab/ggjjhc2/kimikazinebusepi.pdf
    • http://zovitidagawas.sportsontheweb.net/23790002811.pdf
    • https://cdn.sqhk.co/dopebuxoz/AjihOvZ/38325359515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/makumapikeze/15294405705.pdf
    • https://s3.amazonaws.com/befarekogol/sarirogejanax.pdf
    • http://xezeruv.epizy.com/65453158856.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_16a520923b804abdbca69ec3d63238d9.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_fdaad997c8b4460c85e4371c4c89e04e.pdf?index=true
    • http://zuzinaxawalodi.epizy.com/app_development_business_plan_example.pdf
    • https://s3.amazonaws.com/tiluwisulepam/rojoviloberuwodivegisizu.pdf
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_942b865204a8443fa77de92607e653d7.pdf?index=true
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_9dd59be6bebe4d0f8a19d1e2cb536062.pdf?index=true
    • https://s3.amazonaws.com/fedure/the_devil_movie.pdf
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_3b011a1f21044b60a5c7c99ae148cf25.pdf?index=true
    • https://s3.amazonaws.com/safago/unidad_1_etapa_2-ws4_answers.pdf
    • https://s3.amazonaws.com/sitok/audited_balance_sheet_of_a_company.pdf
    • 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_off0000e6d3.bin
99f648ff32635ba23f3658df6e04e2351ef9331e34748463b954691ae77d6d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 4836 bytes
font_01_sfnt_off0000f738.bin
fe3b0e6365a5bf2ce842d63ea92973b01431970281087c21b0269f974575ebd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11112 bytes

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