Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fd6a1880116c42…

MALICIOUS

PDF

74.6 KB Created: 2021-04-11 00:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67744600b483e70e33cad29edb267bfe SHA-1: 1b5cb5e322b3b11c83f4aae6158d1ed9dd98c3ac SHA-256: 55fd6a1880116c425f29c75f3e8315acbc1f1eb1fee65409129a0c595923253f
156 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 0.9996

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 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.
  • 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://nipisod.ru/strik?utm_term=replacement+rim+for+spalding+basketball+goal PDF link annotation
    • http://mavigawika.scienceontheweb.net/64613556685.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/what_is_the_screwtape_letters_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomixogofin.rf.gd/apodemus_sylvaticus.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/dojib.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/career_development_plan_examples_for_software_engineer.pdfIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_07e3c9ad58514df584ff82db82c052ae.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_0d0b2c1d5ae94f919509314e239f7dc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3cf5cb-944c-4bbc-9d04-cbff96db8eb8/types_of_text_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/cambria_math_bold_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa989b9-364b-43d2-9546-ee8e1958a50c/the_miseducation_of_cameron_post_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/netaxetawafemumex.pdfIn PDF document text
    • http://vipebajivakal.epizy.com/gorakhpur_aiims_information.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/traumatismo_abdominal_atls.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/bodawujesedoxerurazewe.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/tafeweta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168bd84a-429e-44cd-884f-8f2e1c52a55c/easy_math_questions_for_first_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfb68b8-ac5f-4f33-9aed-d92d18e54369/37985415952.pdfIn PDF document text
    • http://gigupagupefexo.epizy.com/certificado_medico_escolar_cdmx.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/mainstays_slimline_digital_scale_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/les_miserables_script.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/31397791303.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5688 bytes
SHA-256: 95e018bbf40f71a9bf10a5fa8598fc3cf6be6e61cad615d819f7683fb8969a76
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 11124 bytes
SHA-256: 5d572ca93fbde4353a7bfb428b930f6ff8ca6a2eedc4c2e4ffa13a49481a463a

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