Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21c65d0990259ea…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 10:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6eafb71dd8d5c3a0bb3c02bfbb6d421c SHA-1: 5423f7ac6aa67cab0da18b97bd4f64d17fd3cff2 SHA-256: c21c65d0990259ead8b1a3b66424d63054e42f26465dc859dee6270886c8a232
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on disposable domains or link farms. This behavior is indicative of SEO manipulation or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=entramados+metodos+de+aprendizaje+cooperativo+y+colaborativo+pdf PDF link annotation
    • https://cdn.sqhk.co/duxafanuke/SSjaMn8/write_notes_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/3vgihf1/world_best_nature_wallpaper.pdfIn PDF document text
    • http://reduslim-ufficiale.website/inteligencia_artificial_un_enfoque_moderno_solucionario9qpsl.pdfIn PDF document text
    • http://soldonlakewood.com/zawoguparuzedisidwc60.pdfIn PDF document text
    • https://cdn.sqhk.co/lupejatuwi/geFRdij/guess_the_emoji_movie_level_1.pdfIn PDF document text
    • http://garantiya62.ru/doce_cuentos_peregrinos_resumen_por_capitulos8xmaz.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/fQidxia/17975986759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_6032cb88351be.pdfIn PDF document text
    • http://sreda.city/54825218818g5z80.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/GhfzVSp/xikufubid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_600c18ee97154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_5155802e11c94877b00af849f5672c71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9879e59b-a655-4adb-940e-c0cf652125ae/how_to_reset_a_honeywell_thermostat_th4110d1007.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_a7a604793a3e41d3b2c7ad1e02382ac6.pdf?index=trueIn PDF document text
    • http://jefebewo.epizy.com/pepopowo.pdfIn PDF document text
    • http://mosokiwilag.rf.gd/insert_excel_sheet_into_powerpoint.pdfIn PDF document text
    • http://diwuzenebixo.epizy.com/netgear_wnr2000v2_repeater.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_5182685db4b24f188e6dde4f37617bb0.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_d253f9d180ed4c5e8e3c0c6ebc1bcd53.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 5688 bytes
SHA-256: 4012ef32cc46aeefdd8b7608ec97ac447b8dfaba369e89345229781530295d97
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 11512 bytes
SHA-256: c0b8071a6797c75a87fecfc4eb1a3d6b34e93094f160f80100580af3647affcf

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