Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdef5c9cac0835f5…

MALICIOUS

PDF

85.6 KB Created: 2021-04-03 11:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d5f003216eed8f91aa81d8e1df846567 SHA-1: e6718df1aca108f2d515ac6f41741a7d32e069a5 SHA-256: bdef5c9cac0835f50821a32296f35093046e5b77865220bfef385116936fa2c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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/award?keyword=biochemistry+and+molecular+biology+elliott+5th+edition+pdf PDF link annotation
    • http://btsworld.org/best_small_gps_tracking_devices3efgd.pdfIn PDF document text
    • https://sivoroxusakigob.weebly.com/uploads/1/3/1/4/131453081/9b1fa9acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5fc91c55394b0.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/rhggdlo/popuwatujuw.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/vgdhtgc/jalotowoga.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hagfrib/perplexus_epic_3d_maze.pdfIn PDF document text
    • http://zoomita.fun/jekezigakobulofovisabaw2sw1i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_605967c0def34.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/vutufiwoxurovaxunami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_600e86ad22a0b.pdfIn PDF document text
    • http://kukushpa.fun/capitals_and_currencies_of_all_countriesy7c2x.pdfIn PDF document text
    • http://douchehq.xyz/5762313065251gp3.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/gjKCkGK/3d_car_driving_simulator_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/dygjjgP/guwelagefanonavavat.pdfIn PDF document text
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/vixorusiraxejibelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_99a790a298be4f2dab87b5b236ec54a3.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_36d052c7191845659ec011ff126dce75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77968ce-b86b-479f-b219-5b71226b617b/ropibefepuzusanidif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f671909d-e46e-4374-b0b6-faded9ea6420/mirimilozi.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_92ce93be685f40689cce2af1268d3b01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db4832c-150e-47d8-98fa-6b0ce68b48f6/formulas_para_calcular_el_volumen_de_diferentes_figuras_geometricas.pdfIn PDF document text
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_656d8aa27e724f808f6d1d3bb4774316.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_edd797f3142c4be5ae01cc921b92efb9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 9548 bytes
SHA-256: eb324edcb2b023e24197e21e9f37153d50e865d63d4a03b86c3b6eb410207ce1
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 5984 bytes
SHA-256: bc979a3bf38ff527990a4a08051432b4ebe57aa9933e52fa11b612fbf4feb847
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 11680 bytes
SHA-256: ecac68f0229d8f2779007badd96b366d188ae408362271702c83cf32410ceae2

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