Malicious PDF — malware analysis report

Static analysis result for SHA-256 6957b395d401781a…

MALICIOUS

PDF

87.3 KB Created: 2021-04-21 07:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2dfecc50aae3a1aa9d867c4e3dbf54c0 SHA-1: 765682579a4fb8a530f029653296985bd9bb70fa SHA-256: 6957b395d401781ae85c391243d186a9c7efec6eb4d98ee98506a4dff475e6f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/strik?utm_term=sat+prep+courses+online+reviews PDF link annotation
    • http://zutumufedige.getenjoyment.net/24397137484.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/circular_motion_worksheet_answer_key.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/girogazapopawakonulibet.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/nidorabijijunetiwesesewi.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/71690096210.pdfIn PDF document text
    • http://jakazobik.iblogger.org/autocad_export_transparency.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/63644144915.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/google_maps_javascript_api_show_current_location.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/resize_macbook.pdfIn PDF document text
    • http://zenafek.iblogger.org/45955605068.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/woberevunotixup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_d841474e49a14fbaad94cc2207f2479e.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_26b50504c1df4ccdb14537b15e436800.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nadudugur.pdfIn PDF document text
    • http://nibedob.rf.gd/queen_bohemian_rhapsody_piano_sheet.pdfIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_3ca50250c8664cffbdad89418e4485ef.pdf?index=trueIn PDF document text
    • http://supajiwa.myartsonline.com/probability_distribution_of_a_discrete_random_variable.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/38621022520.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/secondary_browser_app_for_android.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/pelemikujabir.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/42279678711.pdfIn PDF document text
    • http://tutufot.rf.gd/stethoscope_uses_and_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/31869182039.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/why_is_nespresso_machine_not_working.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 5064 bytes
SHA-256: 4b3e7c00bbf52b36b0b837e19130676926d09321484f6299ecd43037dd382991
font_01_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 11452 bytes
SHA-256: 9bb5b339d4a4fe8357240e82cda5c40090fe8b35ab807d7deafd8404c3000bf0
font_02_sfnt_off0001413c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333