Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc6c052a4530ced…

MALICIOUS

PDF

40.6 KB Created: 2020-11-05 22:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8e8a9b19603ea923c38e1c53dd84a5ea SHA-1: 98c705fda43af6b490115162fc71fc5eb2183210 SHA-256: 3bc6c052a4530ceda87bb6e73ed274a16c6c9ea1baca4a9fe44032d15a36b820
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to host disposable content. No scripts were extracted, but the presence of an external URI and the ML detection point to a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/123?keyword=licking+valley+high+school+website PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f9f30ce8fa5a.pdfIn PDF document text
    • https://wumudirega.weebly.com/uploads/1/3/4/5/134515906/fokowasadu_jozejureran_tanejim.pdfIn PDF document text
    • https://fivakamine.weebly.com/uploads/1/3/4/3/134384559/30564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_5f9e76464a4ef.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/3784fbc62aa7731.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/7535962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5fa1473378631.pdfIn PDF document text
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/7dcda6.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/bulolimepol/askep_bronkitis_kronis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6714d870-cb78-4d2f-b4f3-f42b845ed4db/83797847851.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/46794255241.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/asa_softball_rule_book_2019.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_off00005c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3E 5364 bytes
SHA-256: e786926a639f07cc924e7bd638c25731da78f2f6b2d6be6d8ddbe192b36f6a97
font_01_sfnt_off00006ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA9 11376 bytes
SHA-256: e1c86c78fc016a7e6883bdec5b1643652ed494b1e378dbac5f8f4f96fa53f769

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