Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c345b709304571…

MALICIOUS

PDF

72.2 KB Created: 2021-02-24 03:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: bfb9b3eb2a862a091b3e365d858bbe2e SHA-1: ab92194b16e5e05fb1576dbf2f20d662d562606a SHA-256: 22c345b70930457185b2441705f4962bdefbfd6300366be89895d0b51b1c3178
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://leonvi.ru/123?utm_term=origin+myth+definition+dictionary PDF link annotation
    • https://cdn.sqhk.co/verexoleki/Yhiaqz6/lezalusadezewagulowizege.pdfIn PDF document text
    • http://jepatugikanoxuv.iblogger.org/alternative_application_facebook_android.pdfIn PDF document text
    • http://wopafopu.22web.org/transformao_isovolumetrica_exercicios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fcacb514b7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_6011b41641b4c.pdfIn PDF document text
    • http://wupupetobuzune.22web.org/work_plan_template_in_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_602967c22193a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedoruvuseju.rf.gd/lakuvoravoke.pdfIn PDF document text
    • http://fonaxijulobep.rf.gd/affairs_cloud_august_2018.pdfIn PDF document text
    • http://pakatikik.epizy.com/cbse_class_10_english_language_and_literature_textbook_download.pdfIn PDF document text
    • http://fepapasofefo.epizy.com/us_amendments_list.pdfIn PDF document text
    • http://ligumawi.epizy.com/hospital_logo_design_template.pdfIn PDF document text
    • http://kisolapuri.rf.gd/amendment_to_employment_contract_template_south_africa.pdfIn PDF document text
    • http://vikuladaputak.rf.gd/iworkcommunity_resume_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/29917356434.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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 5352 bytes
SHA-256: 40e38e1c30d2afdb5456eeecd60942ccae1f5c815f5ef81e5dca934a77c11435
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 10968 bytes
SHA-256: 0687fb7833114fcbfc444795da4d64b6a905ceb0c98e718a1594bc6db041ba72

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