Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9fc816752770aa…

MALICIOUS

PDF

71.8 KB Created: 2021-02-17 00:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 940c1f5ce18fabea27536ee790a13ce8 SHA-1: 950abfef67eae135207ea8e958a05a6744919496 SHA-256: 1b9fc816752770aaee7239d5f65a609b0e957dea983de65373ef53b03c5d94e4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of link farms on disposable hosting, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=mechanical+engineering+degree+plan PDF link annotation
    • http://salukapebuke.iblogger.org/l_t_financial_report_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_602c4e0ba84f9.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/river_flows_in_you_sheet_pianocmy8b.pdfIn PDF document text
    • http://totudini.iblogger.org/amlodipine_norvasc_davis_drug_guide.pdfIn PDF document text
    • http://lngcliente.com/hunger_games_catching_fire_chapter_13_summaryo43f8.pdfIn PDF document text
    • http://copyrightnotices-form.com/hockey_birthday_party_food_ideashq8dj.pdfIn PDF document text
    • http://redtea.space/wogerurepogofawammif8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fcd50f1017e8.pdfIn PDF document text
    • http://lianhua.life/44541522441cipne.pdfIn PDF document text
    • http://bella24.xyz/a_million_reasons_piano_sheet_music977sl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fed3119b0f65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/automated_process_control_system.pdfIn PDF document text
    • http://kasarokoxakuke.epizy.com/poduvunudasuzujunoxupi.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/86264505416.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/destination_wedding_save_the_date_information.pdfIn PDF document text
    • http://xoxiposewarewa.epizy.com/tujisarin.pdfIn PDF document text
    • http://xetojawik.epizy.com/37414612206.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/kuref.pdfIn PDF document text
    • http://fisowafoz.epizy.com/steam_distillation_of_clove_oil_data_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 5164 bytes
SHA-256: 67c1428e2e7389b942598e62fec6f005576bc1740560f200538fdb7ec370ce66
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 10424 bytes
SHA-256: 3a5d12ae483cc9a575134d49f271d01530fe142f52b9ef283f479d4dbe6c1836

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