Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca2490c2b3d8fef…

MALICIOUS

PDF

75.8 KB Created: 2021-03-03 20:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 07213de32df2c91be2966ba7604e4ed9 SHA-1: 2bc2d0cd720101188c1dbbc1144faf19aa84512c SHA-256: eca2490c2b3d8fef78c58080eb46fec12a5b5e405c82c77f9f45ec27c03124b5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://soxebez.ru/award?keyword=zoom+g11+vs+headrush PDF link annotation
    • https://milavunaxowe.weebly.com/uploads/1/3/4/7/134717052/nonalizuwokosof.pdfIn PDF document text
    • https://genoduvule.weebly.com/uploads/1/3/1/4/131407197/f152955c.pdfIn PDF document text
    • http://mxsale.info/skripsi_akuntansi_biaya_produksi5ee35.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/how_much_does_it_cost_to_replace_a_samsung_s10_screen.pdfIn PDF document text
    • http://it50life.pro/change_gender_monster_hunter_worldldl6c.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/K6jahdu/zetonixakor.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/gqlhgh6/59961535709.pdfIn PDF document text
    • http://ellmax-site.xyz/number_line_addition_worksheets_grade_1b48mc.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/UiiXCge/99188416587.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/a6gfamW/khan_academy_math.pdfIn PDF document text
    • http://physcoo.com/how_to_program_remote_for_allister_garage_door_openerg8u8g.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/tutapaxi/xamarin_action_sheet_android.pdfIn PDF document text
    • http://kelukotezowopob.epizy.com/chartered_financial_consultant_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/kikipepolo.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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 5276 bytes
SHA-256: 1f1c1c6d8d2441b4a1ed8a3d758bd628d32d623dbb54e35fe682f7b0daf9f2a4
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10412 bytes
SHA-256: f6bc78a6581de50e70f482994f10c1d74379e7a81c60cfd42862a9d9cb61ab91

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