Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ded68c9d81785db…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 19:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecb637624874ff869e177e725cc1718f SHA-1: 953445d587baad50a53c5fa02802acd0ee499dce SHA-256: 5ded68c9d81785dbefbaf52a3665e6906c9946ba130f9c4448f8fae8a59b1bb1
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 0.9994

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://vilenefex.ru/award?keyword=l+alchimiste+coelho+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471236/normal_602f7d573ff32.pdfIn PDF document text
    • http://penowidusuj.22web.org/america_the_essential_learning_edition_volume_2_online.pdfIn PDF document text
    • http://riluturuka.22web.org/47308043662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_603a71828b2ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478415/normal_5ff7d9164438e.pdfIn PDF document text
    • http://mishabelle.ru/tubote6ihq4.pdfIn PDF document text
    • http://boothattendant.com/gre_test_prep_books_20209gf6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fd679480987d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_5fd2fc2f6e680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_601e2da991155.pdfIn PDF document text
    • http://bigswinner.space/microsoft_sql_server_express_offlinepg7ww.pdfIn PDF document text
    • http://wuzagabi.22web.org/reading_comprehension_worksheets_for_adults_esl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5feb78016c9e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesepasejufivim.epizy.com/25425113946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa153e7-cf12-42a7-9390-d016a7eabafd/is_doordash_giving_free_delivery.pdfIn PDF document text
    • http://relipig.epizy.com/sample_insurance_cancellation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99dacfde-400f-4ac6-abf2-99f80d553409/fozat.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/43083926870.pdfIn PDF document text
    • http://dukazel.rf.gd/tujevegosoxada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84ea338-5992-4a99-b51b-5fcf668ba082/lutapade.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/betoduxetawabapadiva.pdfIn PDF document text
    • http://xutarefes.epizy.com/rokogoxewisibemixajute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195d3cac-cad5-44a2-8b72-a8480811726b/numigejevidabebat.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_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 5240 bytes
SHA-256: c578d9d1da692e118b1d27e9f25a62808913de96233e34b89b9fc7cb9e7145e4
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 13160 bytes
SHA-256: 9af82969c691a009a7d8f4633a6c1fc95fcfa23e7df0d8bc50393346d224e106

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