Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d6b5d714ace21d…

MALICIOUS

PDF

88.1 KB Created: 2021-03-20 20:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2847811b19616dd364f49b41020db142 SHA-1: 7fa74549add5d4a6b73af619328c11137514ab9d SHA-256: 70d6b5d714ace21d0d477f46dfe2196a1bcb2479e743c160f7b3044579b74090
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URLs, 'https://mezovuduw.ru/strik?utm_term=how+fast+does+daphnia+reproduce', is suspicious. The ClamAV detection and ML classifier strongly indicate maliciousness, with the ClamAV signature suggesting a phishing or trojan component. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=how+fast+does+daphnia+reproduce
    • http://segaruzobuguses.scienceontheweb.net/jumemiminadaxiz.pdf
    • http://gejedesoni.getenjoyment.net/bls_y_acls_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5fff1b6fcd296.pdf
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6013c1a0d3e7e.pdf
    • http://kulotufiw.mypressonline.com/bahasa_arab_tahun_2.pdf
    • https://cdn-cms.f-static.net/uploads/4462775/normal_603ba0774ba53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejados/jumofigavoporomanorera.pdf
    • https://s3.amazonaws.com/tugumeb/high_school_map_minecraft_pe.pdf
    • http://jezevenakos.myartsonline.com/41744117355.pdf
    • https://s3.amazonaws.com/bepukuba/condition_inspection_report_form_bc.pdf
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_c74d5fdcd989426ebbf6cdb1544e2120.pdf?index=true
    • https://s3.amazonaws.com/senodiw/disaster_recovery_plan_template_small_business_uk.pdf
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_084b0efcf519429f942cb77c362c4a34.pdf?index=true
    • https://s3.amazonaws.com/sosupejuxofedo/7119758183.pdf
    • https://s3.amazonaws.com/mozedijiz/cartoon_animals_images_free.pdf
    • http://viwuwijagabote.myartsonline.com/business_communication_and_report_writing_course_outline.pdf
    • https://s3.amazonaws.com/wozoxub/line_6_hd500x_u2_patches.pdf
    • https://s3.amazonaws.com/nonipesikiri/2016_horror_movies_tamil_dubbed.pdf
    • https://s3.amazonaws.com/ritoma/divisions_of_the_nervous_system_review_worksheet.pdf
    • https://s3.amazonaws.com/wulagisi/watch_the_woman_in_the_window_2020_online_free_123movies.pdf
    • https://s3.amazonaws.com/tazopaju/annual_report_contents.pdf
    • https://s3.amazonaws.com/mubefula/how_to_change_braun_thermometer_back_to_fahrenheit.pdf
    • https://s3.amazonaws.com/popilo/ms_excel_basics_exercises_free_download.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_off00011c41.bin
37640706b46765bb4a6bf425b8ff93cf09852bfd18e2d74e67390bc9cfeca04b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 5264 bytes
font_01_sfnt_off00012e38.bin
3c3ca0f2695d52f611c8b42c55a2fea538fe30b44adfdf9e1161f495347405f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 10744 bytes

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