Malicious PDF — malware analysis report

Static analysis result for SHA-256 788f286975d6bc6c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-23 00:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbac01c96821fef153636a0353092831 SHA-1: 23dce7f6fc00d91fbb109715829112ec2f26e80c SHA-256: 788f286975d6bc6c39299d8b66a0933b03fa9c739d9fd2db49703e7194d7e241
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 disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://kuzutuzo.ru/strik?utm_term=how+heavy+is+a+bale+of+straw PDF link annotation
    • http://jijomaj.getenjoyment.net/83664721247.pdfIn PDF document text
    • http://liniwugo.iblogger.org/how_do_i_clean_my_maytag_bravos_mct_washer.pdfIn PDF document text
    • https://sukonusumetuf.weebly.com/uploads/1/3/5/2/135294143/solisegi.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/xokiloxuz.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/90f6e.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/633f8dd7-fc90-4aca-993c-7ccc7aa64701/63068323731.pdfIn PDF document text
    • http://solezod.myartsonline.com/wildgame_innovations_camera_battery_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338d17f7-2639-4e15-ba40-5203e6da8297/71341498284.pdfIn PDF document text
    • http://zotubune.myartsonline.com/89706090999.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/harvey_nash_group_plc_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a051729e-54e7-4dcd-8f37-4a7a0dee5642/tabla_periodica_grupos_periodos_y_familias.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/36190640426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23391920-2f1b-44c8-ad22-170c5b407f8c/how_clouds_make_rain_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac245204-c571-484e-8473-6308ba97bd71/osha_requirements_for_flammable_storage.pdfIn PDF document text
    • http://zizutanerate.epizy.com/kazavetera.pdfIn PDF document text
    • http://zuputes.atwebpages.com/kannada_language_panchatantra_stories_in_kannada_writing.pdfIn PDF document text
    • http://batapijas.myartsonline.com/contraception_types.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 4892 bytes
SHA-256: 2ec7a79edf1cf26902c895362911ff26354c026b4170e2b7d0f3f55de4f20643
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 11156 bytes
SHA-256: f6c103fa13a20dd1cc0e7394ee6d91c1012e10e191308e5f5eab1eede15b6992
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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