Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2128c4cf3aac917…

MALICIOUS

PDF

41.2 KB Created: 2020-11-08 03:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8fcfda49d195d9df21dbd52924141a89 SHA-1: 9acf7d1dadb1abe3c57def2360d1128b52c2d8f8 SHA-256: a2128c4cf3aac9170aecf75a61ae5a6311d45b0ae31eddaa32103091b010a016
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/e2d89df72c73e.pdf.
  • 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://trafffi.ru/aws?keyword=change+wifi+password+apple+tv PDF link annotation
    • https://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/e2d89df72c73e.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/petosevit_rukalogot_namogi_rexofu.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/5538c7b.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/varoragidit.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/dowewejeverol.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/tegitofone_xunen_ritidibek.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/somenotosupiti.pdfIn PDF document text
    • https://nunamazo.weebly.com/uploads/1/3/4/3/134311680/0b8da670d6426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7326606-8298-4c70-9112-4824ff1ed717/calvin_klein_size_guide_underwear.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/40368212409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1c6f3c-cb39-4460-92a0-6719e7c7537b/14021246685.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/28617266971.pdfIn PDF document text
    • https://jawunex.files.wordpress.com/2020/11/everything_on_it_shel_silverstein.pdfIn PDF document text
    • https://guverixil.files.wordpress.com/2020/11/12535852922.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/the_real_book_6th_edition_download.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_off00006362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 5360 bytes
SHA-256: 9df942de1187b199fcb3a6d0216d97bfabbc0196be948923720c1070c1ec34d5
font_01_sfnt_off000075b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B1 10072 bytes
SHA-256: e91d85b6075c24466159d60774bdb1dbf90d6395094f1bb4cc01317feee44bd0

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