Malicious PDF — malware analysis report

Static analysis result for SHA-256 62edca43522846f2…

MALICIOUS

PDF

37.0 KB Created: 2020-11-06 13:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 9a4f0ff4a7a063b83bd985a38bfc3a30 SHA-1: b5fcb6a9e95d86054cbebfed4404757c7a7fa9dd SHA-256: 62edca43522846f2f09c8bdbc201309225bcefebf68a9299489815bf5bec09a4
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://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/kulurexaz_ridanif_siwokerog.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://trafffi.ru/123?keyword=functional+groups+worksheet+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f901a5d4c40c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f95957973461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f8e8c158047d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5f9bbceb26adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f93b4c467a45.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/kulurexaz_ridanif_siwokerog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f979030ec81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fa1ce12c861f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f8787701d365.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fuziwakirub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fa37aa120122.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/mudurixo/mamunoziforiwes.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/48798254718.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/griffith_college_application_form.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_off0000512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x512B 5444 bytes
SHA-256: d960ba27bc3797f8946a3c1c8a4d10a0653b47655b3d2cc433217f2cd20e4de4
font_01_sfnt_off000063be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 10608 bytes
SHA-256: 085e65aebc36c0dc4f34497fa9add73ec3df5bb078db199752a2a1f741b54883

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