Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56af39a4dab2f13…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 09:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d60a6f8942726b9ea4eed05304c7d37 SHA-1: 7062364313fbbe553ef1c943e8266f78b2adf391 SHA-256: b56af39a4dab2f136b01457a34ea90b2cf807415f52c5923f2cfa0c5cc5ff0c8
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 0.9997

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://druttle.ru/award?keyword=nz+aviation+news+pdf PDF link annotation
    • http://fijazubelanulek.mywebcommunity.org/zitodolewa.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/Jgghe58/buvif.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/repavanapo.pdfIn PDF document text
    • https://cdn.sqhk.co/nulupitet/8XQ0sha/tekakabegatiwotutuva.pdfIn PDF document text
    • http://rimka.xyz/what_is_a_branching_diagramvxbal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_6046933b0429e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_601bd1e66c320.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/what_is_the_concept_of_sustainable_human_development.pdfIn PDF document text
    • https://cdn.sqhk.co/wukorovev/idShdjb/85265816548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371497/normal_60043a36587b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fe5ea413ecc4.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/gefutodigibatisumevipel.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/osaka_mrt_map.pdfIn PDF document text
    • http://bigno.space/martin_luther_king_jr_dream_speech_text48l3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_601dd5954aa57.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/bhagavad_gita_in_telugu_free_download.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/numbers_worksheet_esl.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/gd5Pojh/30665260637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_52db06118dd34398a9823f7ebc920856.pdf?index=trueIn PDF document text
    • http://xepuzakudera.atwebpages.com/36905794104.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_134fbb1c3a5d41c49930c71de6b421c7.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_abc369a434bb473f99f3f93501fbfa8c.pdf?index=trueIn 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_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 5080 bytes
SHA-256: 29649bd00fad7ce5e06b6b5eed702b1f232cdfeead848bf6dab87ba0271ff4fd
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 11600 bytes
SHA-256: 33a0710f75adff187da293e41c826315bb9dcfd7d05f470418507a4d2b195536

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