Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aef3dc5f2b3de0…

MALICIOUS

PDF

82.7 KB Created: 2021-03-20 11:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8577f18ca5a195313520cdf914519712 SHA-1: 6d17ecda260f0f37b9ab90d06d6ed1d7b09e44b5 SHA-256: 40aef3dc5f2b3de0327dc3f74d7c59fa0c0825f82c1c21ce49914f894d7011e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards malicious activity, likely related to directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+many+pages+are+in+trials+of+apollo+book+4
    • http://kersita.space/carboxylic_acids_nomenclature_worksheet3lnnr.pdf
    • http://vehicleinsusa.com/what_is_extracorporeal_membrane_oxygenation_ecmo0fpp0.pdf
    • http://de-bewertung-id-q2e5t23.top/writing_point_slope_equations_in_standard_formmksru.pdf
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/wafopiv.pdf
    • https://bowavimizise.weebly.com/uploads/1/3/1/0/131070713/xidikikowoweko-zutimusabo-daralus-segesuku.pdf
    • https://muzobaxokeze.weebly.com/uploads/1/3/2/6/132682229/7296310.pdf
    • http://potolkilife.ru/217297665132snp8.pdf
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/1154844.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoguwavosuje/crafting_guide_runescape_free.pdf
    • https://s3.amazonaws.com/vojapu/dragon_ball_z_psp_games_free.pdf
    • https://s3.amazonaws.com/jedadokuti/91436341309.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_fc026ec70ab44b4e83051bff475db93d.pdf?index=true
    • https://s3.amazonaws.com/nefunupu/free_nightclub_flyer_design_templates.pdf
    • https://s3.amazonaws.com/risalenefazozo/athens_and_sparta_worksheet.pdf
    • https://s3.amazonaws.com/kegovev/20966548945.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/litovurefutonudunezovi.pdf
    • https://s3.amazonaws.com/lorifawuvawot/brother_tn_420_cartridge.pdf
    • https://s3.amazonaws.com/wokesabisevo/how_much_is_a_cell_phone_ticket_in_california_2021.pdf
    • https://s3.amazonaws.com/remavuj/printable_calendar_october_2018.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_8052de5b00dd49a190d9922a4da76316.pdf?index=true
    • https://s3.amazonaws.com/gelawiweza/it_security_incident_report_template.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_df51c7fe36dd4b1d9fbe196cecaf9674.pdf?index=true
    • 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_off00010323.bin
f04d35b76336a85b2eacd2baf3d6cc77ad56fa1386bcdbf056a9c316b30bd225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 5668 bytes
font_01_sfnt_off0001167a.bin
b9ea9f3b9c588d4627cd2cedf44542c2077f56d26938ea994985decc1de0cdac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 11332 bytes

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