Malicious PDF — malware analysis report

Static analysis result for SHA-256 87154820fb5513ce…

MALICIOUS

PDF

73.9 KB Created: 2021-03-03 12:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ba997c755920c311bf1297c231ebf458 SHA-1: dd3a7c38a8327d0309acc41e88f81c811e294354 SHA-256: 87154820fb5513ce83310efaa4690cc27942085e286a69c8685d3dac4cab0f42
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

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://resalured.ru/award?keyword=what+is+personal+and+professional+development+pdf PDF link annotation
    • https://cdn.sqhk.co/tedalome/bljdv4D/75306921668.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/mubafizotujifezijuwupudo.pdfIn PDF document text
    • http://cesaregaspari.com/rosario_de_liberacionc4lbn.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/safety_in_everyday_life.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_6039dfce1d54e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_601d004682a6e.pdfIn PDF document text
    • http://chebsvet.ru/trigonometry_questions_for_class_10_icsetf9ce.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/the_worst_mistake_in_the_history_of_the_human_race_article.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/ggh7Ijg/79180456933.pdfIn PDF document text
    • http://apple-fruit.space/25776573589luqkz.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/pubujobi.pdfIn PDF document text
    • http://regse.website/performance_appraisal_system_for_teachers_blank_formdxpyl.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/bid2HX7/26079420563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_601973cbe4e1d.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/witaw.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/naxozelozude/learn_java_programming_in_urdu.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/mtd_8_26_snowblower.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/84201181645.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/tabibem.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 5356 bytes
SHA-256: 6b49c20a6b31c022ef8929f7bc392823eae7b19fda0bd72b26846689d3472f33
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10240 bytes
SHA-256: 31e3c642d3abb5f395ccf2f36c22ac8703389308d293e9d38555685800504612

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