Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb99ba0b058f36c4…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 19:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 59843e6874618304520fa80ab3716181 SHA-1: cc45136cb6877f196bf5864510ac936ea77a85bd SHA-256: fb99ba0b058f36c4be0842b266898d517d12240af43f31958ee35f453b2e354c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one pointing to 'leonvi.ru', suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=wayne+trace+schools PDF link annotation
    • http://reveruverof.medianewsonline.com/25615606409.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/VKBmjc5/susizoxumexifubenuxotirux.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/excel_spreadsheet_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/QhgRyd3/garena_shell_top_up_bangladesh_bkash.pdfIn PDF document text
    • http://wogigafulokeme.22web.org/wobixivufanabawi.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/XJihhf2/free_fall_3d_svg_files.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_601de045d9a72.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/jFhj95O/fikemudazibuxitawezof.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/shjDIrN/56232784904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_60391919aaff6.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/zefuruvifajerematol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b0a24d-a7ea-4a2b-86aa-9e3314ff9814/can_i_delete_ntuser.dat.log1.pdfIn PDF document text
    • http://kobewanen.rf.gd/android_auto_not_working_on_sync_3.pdfIn PDF document text
    • http://rerorisa.epizy.com/lekir.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/simple_bootstrap_footer_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1436622-e284-4f41-bba4-13ed6bf0c5c0/lepifaraxonaxudojowugulu.pdfIn PDF document text
    • http://xisirajotijejuw.rf.gd/pollard_a_user_guide_to_measure_theoretic_probability.pdfIn PDF document text
    • http://pasexojubil.epizy.com/79027089165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deed4359-c382-4a39-9063-93a07ca4aa5b/morse_sewing_machine_guide.pdfIn PDF document text
    • http://xubexiv.epizy.com/mcdonalds_employment_application_form.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/tiset.pdfIn 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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 5000 bytes
SHA-256: e0bebd2f8de20a0cecbb120846a0046bef7a2924949143dc73c7d2179551724c
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 11816 bytes
SHA-256: adfd363b3a6a74242c8adc9507ba32fd1dc7e9186bba3527f55f7bed75af6a85

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