Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d87d86deb03f7…

MALICIOUS

PDF

76.0 KB Created: 2021-05-18 15:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6600ebf1893288e666f3a8841295c32a SHA-1: 99da02a1c30cd2cf2f3f67f02751f74d232395dd SHA-256: 4a7d87d86deb03f79f1e3f136f02a434647b2e9adf55fe68042549339d64b9e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=multislotting+f2l+algorithms+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385633/normal_6003af61c6b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_603746d3280e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_601b9310de8ff.pdfIn PDF document text
    • http://sotasiwelo.22web.org/libro_de_abramelin.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/sovosomojegatixip.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/nadewubofebuda-potegor-dejunumiwex-vebum.pdfIn PDF document text
    • https://fapudajom.weebly.com/uploads/1/3/2/6/132681453/pegujabazagozu_kesuviparaxuter_rulodokazurite.pdfIn PDF document text
    • http://juvozukatug.66ghz.com/88521147151.pdfIn PDF document text
    • http://bujisefebegegum.iblogger.org/aging_society_and_the_life_course.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/8f0125f2d.pdfIn PDF document text
    • http://rikedenufag.iblogger.org/abrahaminte_santhathikal_movie_full_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5fe39baa61654.pdfIn PDF document text
    • http://kameregeperiwaz.22web.org/les_animaux_fantastiques_livre_gratuit.pdfIn PDF document text
    • http://funuretebinuzos.iblogger.org/vernier_calliper_download.pdfIn PDF document text
    • http://betixisu.22web.org/neuralgia_del_trigemino_articulo_de_revision.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifujurudale.epizy.com/41046246351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdddc91-a359-4257-ad92-096cb678e908/nuraxikamapodavoboget.pdfIn PDF document text
    • http://jenegawu.epizy.com/36718819121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578321ab-f587-47ca-9f7f-a19e13c54333/98892826895.pdfIn PDF document text
    • http://bukogog.epizy.com/44458015756.pdfIn PDF document text
    • http://domapabef.epizy.com/48860491204.pdfIn PDF document text
    • http://rasimifufabe.rf.gd/the_husbands_secret_book_movie.pdfIn PDF document text
    • http://pafaxifusawa.rf.gd/vopavobikefojikimarabufi.pdfIn PDF document text
    • http://vozovowu.rf.gd/how_to_change_directory_in_cmd_command.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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5592 bytes
SHA-256: 4b9c836913f045f968c9018459935d061ec553c4d5804e617d01e7ae9d16dbea
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10180 bytes
SHA-256: e6a8cc058e1fcfd2b2a9c07bca6bb482ed2b703946f5b662d06f8f976ec5c0a0

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