Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f153c41f21c2b8…

MALICIOUS

PDF

74.0 KB Created: 2021-03-23 02:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9d3f5a49856976ab407ab6e5bbc07410 SHA-1: d1f9d0c9fb2443ff08ae39035156e4e42a0eec29 SHA-256: 57f153c41f21c2b8c9c7456bdddd1d172d6083ca5a4540d6e12538901f252feb
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 identified as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://druttle.ru/award?keyword=analyse+2+exercices+corrig%25C3%25A9s+pdf PDF link annotation
    • http://timelessdecorum.com/8601629972n564v.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/old_huckleberry_finn_book_value.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/excel_vba_msgbox_value_of_variableq0det.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/tube_digestif_des_insectes.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/dijasimefoko.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/9778544.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/what_does_binomial_theorem_mean_in_math_terms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_603cfe8030cf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_60415832dd8eb.pdfIn PDF document text
    • http://maykistore.ru/why_is_my_softheat_heating_pad_blinking_redr5tgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_6032d8d9ccc6f.pdfIn PDF document text
    • http://fajamad.mypressonline.com/tijosepepaloz.pdfIn PDF document text
    • http://farvestnn.ru/ditesikekv9b5.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/jijubitideledozojuiulqe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f521b2-cea3-4977-8c09-e2e64b0e9fa0/64781276602.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/92054379055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48731693-211a-439e-901a-19d7a90200db/jepomipubipibiwevufufur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa11bde-007e-45c0-8f3c-307db607f848/15323364347.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_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 5756 bytes
SHA-256: 1659c70f2ca1832e2a285643297d6bdbdac95e6a7f90a63b5f69d4054af9f5df
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 11968 bytes
SHA-256: 27056e5349c53c856981e258fff9d0c4b5f3e0391461c1b5d808aabfae125b9e

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