Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2dc95cd930d9ff…

MALICIOUS

PDF

77.6 KB Created: 2021-04-27 14:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 99bbec4ada0001b4c85499d6385d50f3 SHA-1: 544a20432a0f9268361e4a547b1874d996bd841e SHA-256: bd2dc95cd930d9ff090321747c4b461d0944f5dfb84e4e6d86ad0edbe308196a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://mezovuduw.ru/strik?utm_term=yo+amo+a+juan+querendon+capitulo+150 PDF link annotation
    • https://cdn.sqhk.co/wadelovelo/jjyKhfd/94878690303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_606a7b9069fa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420905/normal_60084d846a6b0.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/hBUgdCR/75942292269.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/9954451.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/bogorufukatu.pdfIn PDF document text
    • https://lopinelu.weebly.com/uploads/1/3/4/3/134369173/6cd71b46df.pdfIn PDF document text
    • https://cdn.sqhk.co/jopogoxom/jihhbhe/agile_methodology_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/e7G2ia3/lobbying_synonym_in_urdu.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/goberomutunubimak.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/pdf_file_reader_download_for_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426409/normal_5fe18a28b4be4.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/68221104990.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/ZNYibjb/can_can_violin_sheet_music_with_letters.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/xghhdii/42549715444.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/c6d85106160345b.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/LP8gidC/kumogukavu.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/calculus_early_transcendentals_2e_briggs_cochran.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5ff2bd41aa4a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romofimor.onlinewebshop.net/19670959451.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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5524 bytes
SHA-256: 91673f8ed121622c8128049cfdd43fe18153551cd7ed2f5a316474afe44021f6
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 13480 bytes
SHA-256: 61535112d1229e38e5edad252a493d21eaa297e4e22233172e4e732e0f1df05f

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