Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb227a78fd2b7f41…

MALICIOUS

PDF

76.9 KB Created: 2021-02-11 20:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e3f0eb28bce8b3fc866ad98d1ce2a648 SHA-1: b9fb122e2b5ad8c7d51ef64d3b3f356c690bf2ea SHA-256: eb227a78fd2b7f41063007cdf73dfb8cb2b461c9c489d671c7399c2a7e97dca6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

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://jacksth.ru/123?utm_term=varieties+of+language+in+sociolinguistics+slideshare PDF link annotation
    • http://nazevulilabume.66ghz.com/agricultural_products_marketing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fd289e45be99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fd0472217dbf.pdfIn PDF document text
    • http://omshop.space/free_model_airplane_planssalu5.pdfIn PDF document text
    • http://coins24h.com/84440608539uc6q7.pdfIn PDF document text
    • http://preplafond.xyz/difference_between_anatomy_and_physiologyi63jq.pdfIn PDF document text
    • http://harkateine.fun/11259383778cau0a.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/idihd69/solar_system_and_star_system_project.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/dCijfZD/57194026812.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ghbjeYm/ncert_physics_class_9_motion_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likasiz.epizy.com/dreamscene_activator_windows_7.pdfIn PDF document text
    • http://wepezip.epizy.com/61195819242.pdfIn PDF document text
    • http://kavisawadafo.epizy.com/61395327950.pdfIn PDF document text
    • http://daporanil.epizy.com/wutezetipogokeretopaj.pdfIn PDF document text
    • http://nibimasumexugi.rf.gd/sizuja.pdfIn PDF document text
    • http://butadiviwev.rf.gd/zofisi.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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 5248 bytes
SHA-256: d1b26648ca0ea54674c8aff2503ac3b8dc5e42e3edab2a6d33cde1acf4d589e7
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 11976 bytes
SHA-256: 0d220d3782d3c1aa2cb9ed008c1913716aaeea8b132c2a543bb6cfbed829ba69

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