Malicious PDF — malware analysis report

Static analysis result for SHA-256 100242ceaab6216e…

MALICIOUS

PDF

51.0 KB Created: 2020-11-05 16:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: f9b2e5388dd06d97c78aace0003f972f SHA-1: b4341105f7876b96fd96aff804e81fef809437a8 SHA-256: 100242ceaab6216e1f10db47f5f8e3012adc001842761153d3921f485ef66b14
196 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://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/jotuxafivawanawa.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/aws?keyword=gmat+guide+pdf PDF link annotation
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/jotuxafivawanawa.pdfIn PDF document text
    • https://sagekafota.weebly.com/uploads/1/3/4/3/134351395/2769161.pdfIn PDF document text
    • https://kakoxisowi.weebly.com/uploads/1/3/4/3/134358665/sazinaminabixo.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/kagaza.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/876783.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/lapemapejemix.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/kuboki/virtual_hottie_2_unlock_code.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/lenape_valley_regional_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/vomakutupib.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_off000087b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B3 5088 bytes
SHA-256: 0e166160d08f92bc204c626f9293722106f9ff21cd0f792d49b14421181d021c
font_01_sfnt_off000098f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F8 11104 bytes
SHA-256: b5dfc5c178e4c67fe533c8ea36ef52a5f963fa3df35f2021a06f4395660fc4e7