Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c3a4014eafa82d…

MALICIOUS

PDF

77.0 KB Created: 2021-04-21 18:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51e44f56aff924a7227f6f92cd446996 SHA-1: 75465d528ee06af0c6cfb17d7eb59021feeabd9a SHA-256: 32c3a4014eafa82d0ad84e6d1186e29a7094c3d3bcd2d669c9134ee542190ded
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF link farm' heuristic. One of the primary URLs, 'https://seumenha.ru/strik?utm_term=does+harris+bed+bug+spray+work', is directly associated with the malicious verdict. The presence of numerous links suggests an attempt to direct users to potentially malicious or phishing sites, aligning with spearphishing tactics.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=does+harris+bed+bug+spray+work
    • https://static.s123-cdn-static.com/uploads/4495854/normal_6003d111054da.pdf
    • https://cdn-cms.f-static.net/uploads/4384320/normal_6067002982218.pdf
    • http://rujewazaxijaza.sportsontheweb.net/b._sc_nursing_syllabus_mgr_university.pdf
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fe0139f9dd3a.pdf
    • http://tulumiv.medianewsonline.com/kefomuvomulinakuwoso.pdf
    • https://cdn-cms.f-static.net/uploads/4368471/normal_601623e3274cc.pdf
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6047d296b4aff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowawaba.atwebpages.com/water_pollution_project_in_marathi_file.pdf
    • https://s3.amazonaws.com/nalifij/discounted_cash_flow_valuation_excel_template.pdf
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_7cd19aaf85c144fcbfcc42418f731a3d.pdf?index=true
    • https://s3.amazonaws.com/pululusodogi/jafexu.pdf
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_de8b2ad47da64262b0e0171855b78e24.pdf?index=true
    • https://s3.amazonaws.com/fuwenoxuzasila/acapella_video_maker_free.pdf
    • https://s3.amazonaws.com/nemafu/53572534713.pdf
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_c8acb3c7ee364e28b5a063798bdf1110.pdf?index=true
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_f7651ada3e9b401a8ed3d3beb077b1f3.pdf?index=true
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_82f65649ab4e41f4ad3eafb7fd6d0501.pdf?index=true
    • https://s3.amazonaws.com/mawesenasijoser/ham_radio_license_oregon.pdf
    • https://s3.amazonaws.com/dubiditiginowo/lorodeguba.pdf
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_8501f38c7914442db61bd32fbebcf4be.pdf?index=true
    • https://s3.amazonaws.com/nitidadufetenu/31424322463.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_5f25be07709d43cdb7b2d310460c569a.pdf?index=true
    • https://s3.amazonaws.com/nazekisigiduz/death_note_netflix.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_off0000eddf.bin
9835710b973c0a6be0d805bb0c642bdc8f2505228295fe345bdb4b16ef07a2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5584 bytes
font_01_sfnt_off000100ef.bin
92e7e6caa9b431c1170740b2f9c6853111583b82d6b40089550090bfc0800a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 11020 bytes

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