Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3d8b4369423977…

MALICIOUS

PDF

72.1 KB Created: 2021-03-18 10:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e7b07e3aa43618f24e2c065dac1b9c4b SHA-1: 90d2442ba8ecf80647d3c213cdd067c70cf1557b SHA-256: bc3d8b4369423977c2e9f8fe383d73c76844dc841c845051dc8de3e2a884b271
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=outlook+email++for+windows+7 PDF link annotation
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/71060723487.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/the_idea_of_the_world_bernardo_kastrup.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/rewurawomuzevapisotu.pdfIn PDF document text
    • http://gutufozif.iblogger.org/describe_the_suns_photosphere_chromosphere_and_corona.pdfIn PDF document text
    • http://viwavorikag.22web.org/libro_de_baldor_geometria_y_trigonometria_gratis.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/how_much_is_david_on_love_it_or_list_it_worth.pdfIn PDF document text
    • http://jabofuzo.22web.org/free_daycare_flyer_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dofagubixipo.rf.gd/sonurudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c3c033-b79c-4acb-b69b-eca11f1437f3/faluxafigefipulegovugesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de631aa8-bfae-4817-a07c-42a0d797daae/79710010696.pdfIn PDF document text
    • http://tujigukaxez.rf.gd/les_fourmis_bernard_werber.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/dj_techtools_midi_fighter_twister_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4cab0e-37d9-4a2f-87b9-3177ec20c972/how_can_you_tell_if_a_painting_is_a_reproduction.pdfIn PDF document text
    • http://vulevusevugola.epizy.com/fluval_406_media_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4141588a-2d0e-4fc4-af63-7f22d0692266/what_are_the_protocols_used_in_osi_layers.pdfIn PDF document text
    • http://suxanovovogemi.rf.gd/char-_broil_performance_tru_infrared_parts.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/xivas.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/vemipobude.pdfIn PDF document text
    • http://penevebepor.epizy.com/76266962267.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 5316 bytes
SHA-256: 92f418d458c889efc75b17544582a424dcb97607548cb03d4dde09f45e738667
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10396 bytes
SHA-256: eed6c1b1dda8d985c0e80a02a98f5b07d1f63a615fb84b6f6a4e6e003a2c4bca

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