Malicious PDF — malware analysis report

Static analysis result for SHA-256 379f63396d917ede…

MALICIOUS

PDF

90.0 KB Created: 2021-03-23 17:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5909381f80885683687d057f2dfabcf1 SHA-1: 9d1aa98103985621326b4677a5f18883a6bb4a04 SHA-256: 379f63396d917ede60829bc4ddbfed35ad8b77cf34d87cb13b8d97c3b3cd4217
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 0.9998

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://jumiwimov.ru/123?utm_term=finanzas+bursatiles+gamaliel+ayala+brito+pdf PDF link annotation
    • http://zagavexakagin.mypressonline.com/who_said_suffering_is_a_sign_of_intelligence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_5fd31b9736f09.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/48658539554.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/61624914623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_604d6ab0c143f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_60450b7b00bbe.pdfIn PDF document text
    • http://artdebug.site/experiment_1_fermentation_by_yeast_data_tables_table_1_yeast_fermentation_dataglm7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fe7754db89a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6048c6dd164c3.pdfIn PDF document text
    • http://amsidisi.xyz/ahsoka_tano_book_read_online_freel482a.pdfIn PDF document text
    • http://pixelbarista.com/bournville_cocoa_powder_nutritional_informationw4ydv.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/jane_austens_persuasion_2007_watch_online.pdfIn PDF document text
    • http://quickpapp.online/scholastic_vocabulary_packets_greek_and_latin_rootscm837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratazudawi.epizy.com/definite_indefinite_articles_worksheet.pdfIn PDF document text
    • http://jubalagifagusop.epizy.com/nagukoke.pdfIn PDF document text
    • http://todizegi.epizy.com/34749477917.pdfIn PDF document text
    • http://botovomevagexe.epizy.com/factoring_perfect_square_trinomials_worksheet_with_answers.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/unapproachable_east_3.5.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_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 5608 bytes
SHA-256: 38f04f64feb126f945cc1ce2fbb92ab272928eeffefbd98dde217071d0bcd68c
font_01_sfnt_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 12036 bytes
SHA-256: 077fb006a6686cfe5684beb30af33ac97ad036dba536d7cadd9a843d0c155371

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