Malicious PDF — malware analysis report

Static analysis result for SHA-256 23524744f8d35d3a…

MALICIOUS

PDF

86.9 KB Created: 2021-06-07 01:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ddde5ab9b904d3981aaf220d77313a43 SHA-1: 047422054c1c1843c83466c38552934b30f054f6 SHA-256: 23524744f8d35d3ad8223b0045366e20dd67a567e240a96abbd112b74c47a7a2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs point to disposable hosting and redirectors, suggesting an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=android+get+file+from+assets+folder PDF link annotation
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/8d584512ad26f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5fe42ab6e96dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_6026cd0e5ceaa.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/3256771.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421214/normal_60b1d40c640cc.pdfIn PDF document text
    • https://vapotilixivurok.weebly.com/uploads/1/3/0/8/130814345/974f2ecf.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/jaluwug-livifodidez-mesex.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/sawikakavivenulamose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/15cac321-655b-446e-ac6c-bdd690e57596/descargar_cancion_de_rochy_rd_rumba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3fdc97-d3bb-4cd7-b26a-e8845fa215ca/38011333442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44782cb4-78c1-49ff-bf4e-5904b6959a81/27846762928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90035236-23cb-4969-a476-251aa0de3975/what_does_it_mean_when_a_man_says_my_woman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4148f168-06fc-4c01-a4dd-91ee5a7a2b13/wumufomavodifulivila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a476c56-8d8e-41d3-bfb5-c19190a950b2/44903607631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa51d386-8dc8-448d-99a7-64aa9dd55b9b/ejemplos_de_dialogo_directo_e_indirecto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ecbee8-cfe0-4566-bec1-d864d79f106d/39541999310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5c987a-a512-4721-bcd5-677048da7135/60895903461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb7ef5c-e472-47d9-8a2a-2b2115fa50ee/cursos_de_ingles_en_new_york_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cecff32-ccee-455e-a25b-53377aee0681/34532632611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae0f621-8b1a-451b-889d-781504f2cd75/15590833059.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5312 bytes
SHA-256: 0e7e9c44b09cdb39c1c6cccb7d1a1ea0dbf78c5acb64b9c5d0fb1b14e77644c1
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 5004 bytes
SHA-256: 1e0eddc99bca67185c7fad755924c558f8defaa39a1a7219e475314a192a23ad
font_02_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 18684 bytes
SHA-256: 4c0dfc650c765e5b7ced27407acec113d71b01e97cf9e831062f4a088b191c57
font_03_sfnt_off00013dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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