Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec1ba3544f7867e…

MALICIOUS

PDF

73.8 KB Created: 2021-01-25 05:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b07f1cddf92a15047960654c6cc237fc SHA-1: c650f586714b3839b8ae294736066386f4f95100 SHA-256: 8ec1ba3544f7867e577bfd8ed1ae06a7f011f4b2dec28381c0bcbf80b240e7b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=silver+sword+philodendron PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fd81a4bcf062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_5fe9d81f4dff0.pdfIn PDF document text
    • http://letidorega.22web.org/oracle_forms_11g_forms_builder.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/978a3a616273.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/jalimesazerujudamo.pdfIn PDF document text
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/mukef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5feb94495527b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fe77409edbcb.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/wokebawukojikoketotid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disorasejazamu.epizy.com/ashby_school_6th_form.pdfIn PDF document text
    • http://napubuxuwel.epizy.com/upstream_b1_workbook_answer_key.pdfIn PDF document text
    • http://galikamot.epizy.com/the_canterbury_tales_character_worksheet.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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 5092 bytes
SHA-256: 5375dfa189f04a8d17b6cc73171db7ca855b84a1cd587cc4db66ed0f4e3f732e
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 10924 bytes
SHA-256: 17fe1b955218df476fccc835d6cb85991b364217a3b0ef2b4f8705f67f13ccef

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