Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ade336d791f29e0…

MALICIOUS

PDF

84.9 KB Created: 2021-02-17 06:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09c7a607597829970bbb7b0c7980c2f2 SHA-1: 5b8e556e07aafa3bfd524f0f32167a04ffcb65ea SHA-256: 2ade336d791f29e029d631c0d92826b2463e44e9b07a2db5ed07d53e632f26b5
66 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume and nature of the URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=how+do+you+disassemble+a+sole+e35+elliptical PDF link annotation
    • https://cdn.sqhk.co/jijipidub/eUhbMgi/69696083681.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/ZyRPkQQ/college_football_referee_salary_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_602a9701cd22a.pdfIn PDF document text
    • http://genogiwibodel.iblogger.org/cessna_150m_owners_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489583/normal_60060489732b5.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/5gdjfUi/40273936466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6014f89a7d231.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/2kzcNab/gorikulizejunojidazofe.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/wXrjc50/dora_saves_the_crystal_kingdom_we_did_it.pdfIn PDF document text
    • https://cdn.sqhk.co/wogigixa/Hjipwif/90547389807.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/QjggcAM/roku_premiere_plus_review_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367301/normal_5ff5b63491cc6.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/EDjjyjj/imao_in_texting.pdfIn PDF document text
    • http://velavedi.iblogger.org/symmetry_worksheets_year_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_602a21599eff4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jinizegujez.rf.gd/imagine_dragons_believer_sheet_music_free.pdfIn PDF document text
    • http://fugovolit.rf.gd/embroidery_work_order_form_template.pdfIn PDF document text
    • http://xuperag.epizy.com/21218295397.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/bulutik.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_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 5708 bytes
SHA-256: a4a99cda9ecc41cc86fa301c33234f717026f6e3b9b5f43ace47e2052d8df3c0
font_01_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 14620 bytes
SHA-256: efd5a3f418a9b10080e820f9676ba4ae697ca39fa7bf76e4653f4ff203197249

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