Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5b8322cdd29ed6…

MALICIOUS

PDF

97.2 KB Created: 2021-03-11 11:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59f4f2bbc6553bfe0c452ef2c742451c SHA-1: d54ba520a026d600f9f47cb7472978e6c71ffcf6 SHA-256: bd5b8322cdd29ed6624f42915224ceed3465bfd910460379248c198846be1391
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/123?utm_term=eats+shoots+and+leaves+worksheet PDF link annotation
    • http://clientesdkb.com/spider_man_3_psp_csov5w5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fe00b7938254.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/can_you_sue_a_judge_for_child_endangerment.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/angular_5_documentation_download.pdfIn PDF document text
    • http://tevfikyuce.xyz/sunewixawijijadanezifeg3xfcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_6027f98d3433f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5fd7dc5174ce9.pdfIn PDF document text
    • http://help-business-media.com/ginofedopurifibujinaj3iwps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_6a84c6338538406fa05addb7914f5966.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_f6965970ce93423fbac5f293d81c95bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8e43f0-6d58-451a-b853-926fbbe0c41c/dream_interpretation_book_wong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d67bcce-e5cf-4e8d-b55b-2e7fe43bbd38/why_is_my_dell_latitude_not_turning_on.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/coliform_mpn_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d18690-74e9-4295-838c-40e1e4e7a5e6/zuguzutugon.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/bulamadider.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/best_operating_systems_2020.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_e6b337dc91094f32bf1c0341db59e598.pdf?index=trueIn PDF document text
    • http://zijedan.atwebpages.com/wade_s_rules_boranes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0bfd1e-a0e3-492f-80cb-e714ab590049/64998221335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f280eb-b18c-446b-a3bc-2a9d0b02f2ca/can_i_use_iphone_as_webcam.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_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 5084 bytes
SHA-256: 814d0df149b26dafa58030f34f3179ae819e1c8e540c7e631117640cd8652c79
font_01_sfnt_off00014cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB7 13024 bytes
SHA-256: 3999bf7b4750132f27db9e4108c0c2ded6267437fb775aee08032d2756a7323f