Malicious PDF — malware analysis report

Static analysis result for SHA-256 86937753a5f70159…

MALICIOUS

PDF

86.3 KB Created: 2021-02-25 18:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: deecd5059a9a2c2a00bca1e6db115b54 SHA-1: 2d8bf2a526efaaec64bedd57e8f8c8cbb360a6c0 SHA-256: 86937753a5f701594703ba0789e3bcd10563bc9b0751ee64ed8d9f3a076a79d6
286 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/5829f801fba4f.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/123?utm_term=how+to+reset+your+voicemail+password+on+verizon+phone PDF link annotation
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/5829f801fba4f.pdfIn PDF document text
    • https://nujatorub.weebly.com/uploads/1/3/1/8/131858108/famitu_mifajikek_domirux.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/19248816878.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/gChdje7/ligogibagafokebimupizutez.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/4331219.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/dWibCiS/ludujofoporidepoxaximes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601c5bb115604.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/gjrjixt/juvugezib.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/lixobolowebugez.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/bhb4cx3/nick_robinson_a_teacher.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/gJYBiaJ/3521400643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/candy_stripe_spider_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/13529432197.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/misbehaving_richard_thaler_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/class_diagram_for_hospital_management_system.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_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 5576 bytes
SHA-256: 8d872e12adc2ef9823f9758641f7cee3f0405f4fe725b779fa5db34f3478abb1
font_01_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 11012 bytes
SHA-256: 287e58ab34d039d32ddb45d2aa3837798842c29af4a670a39331ad5e56e92a6b

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