Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d42acf2452d2d4a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 15:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 77217fbb81d94f89f0c4e76d477cdbf4 SHA-1: 10ced5e5636f97918190bd947b76ea09e8761adc SHA-256: 3d42acf2452d2d4a3635f506305312e6948c0680212f5d4c89be8cfca2778bfc
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to a network of sites, likely for SEO manipulation or to serve additional malicious content, rather than a direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://mezovuduw.ru/award?keyword=tp+d%25C3%25A9nombrement+des+coliformes+totaux+pdf PDF link annotation
    • https://cdn.sqhk.co/kosenopelid/ghylhfY/19611297568.pdfIn PDF document text
    • http://nashremont.site/rafudawab4862.pdfIn PDF document text
    • http://com-servers.online/apple_book_appointment_penrithgor5u.pdfIn PDF document text
    • http://milanbeachs.space/corporate_finance_berk_demarzo_4th_edition_solutions_manualgo5a4.pdfIn PDF document text
    • http://kuzamejeluwezik.22web.org/invitation_templates_microsoft_word.pdfIn PDF document text
    • http://xaxebegolozagu.iblogger.org/vasakumuteremiwewepogumu.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/1yHNiWd/rare_beauty_foundation_swatches_360w.pdfIn PDF document text
    • http://bazegal.iblogger.org/sevip.pdfIn PDF document text
    • http://vofokifuzujusi.iblogger.org/types_of_dna_a_b_and_z.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/hbjjfco/32837344911.pdfIn PDF document text
    • http://fanuvowebutil.22web.org/dilations_five_pack_worksheet_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufeniwa.rf.gd/different_camera_shots.pdfIn PDF document text
    • http://fosudav.epizy.com/16875941239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c837b47-7e87-49ff-8015-ecc3aafc12b7/the_red_pyramid_movie_where_to_watch.pdfIn PDF document text
    • http://najorenowodume.epizy.com/place_value_chart_printable_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a27caf-7813-41e0-b7a5-cba0994e0f1e/susies_magic_binding_technique.pdfIn PDF document text
    • http://gebogozomusedom.rf.gd/dengeki_bunko_fighting_climax_ignition_pc.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/42902771052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed55e1f-70e7-421c-a2df-4386a886ec07/optiplex_755_compatible_graphics_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975bf284-a640-4474-a985-fe419eff387d/pinesutuk.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/likatafunepumawiz.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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 5600 bytes
SHA-256: fe7584058d48e315a2c11b74fe2934a97215b95f49c17dd7eeb65fe2f671e9a5
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 12052 bytes
SHA-256: fc94d7e04ca1b7786bca67399c1f2c81ecb2734dc503cc35a34aff4bcb29fc9f

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