Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9979b5474d07e0…

MALICIOUS

PDF

67.7 KB Created: 2021-03-15 22:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa1c7b2ce44f92c82061ab71254d316b SHA-1: c8edc61d3ded02c50b40b7ad19bcc88f9a89ac9b SHA-256: 7b9979b5474d07e01d0ec3119c61f841e0aa39ebcff0455f06401be0e4ef908e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=all+amiibo+nfc+tags PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410459/normal_603808984db68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_60089e24cbdc6.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/ultra_supercritical_boiler_technology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5fc87212da458.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/7_times_table_chart_up_to_30.pdfIn PDF document text
    • https://cdn.sqhk.co/simosukolevo/9hblptx/17816250879.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/estimating_division_worksheets_with_answers.pdfIn PDF document text
    • http://fibaratibe.22web.org/capitalismo_periferico_raul_prebisch.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/cjjeYgl/kuzobeposuxodufofopetukid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_601a9c653b966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_604b577cb435d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamelaluwer.myartsonline.com/how_to_open_basket_in_farberware_air_fryer.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/lamitowutilopik.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_851da54eeef34473a48ac18851606d14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4907cc8f-1bec-4ac0-bfd4-fb02986b4e87/41856389859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967f0cb3-0d32-4bde-8227-c0c75299396c/cuantos_kg_tiene_un_metro_cubico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e607d65b-5013-4258-af91-362c381ec138/lifonefavuguxekufalo.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_eb9490f3cdf5414d95f8fea0d5a0ab68.pdf?index=trueIn PDF document text
    • http://miwewugewu.atwebpages.com/how_much_does_a_rinnai_water_heater_cost.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_f69079e776124f0e8ec8c0fbc9afa20c.pdf?index=trueIn 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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 5236 bytes
SHA-256: d1cdc68eedc4035aef962fda8b997fe11cc92d55d91b8342e8bc21781394f9f3
font_01_sfnt_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10888 bytes
SHA-256: 59781957baf9a900facbc975fd57bd68a563516b9f646698c0c237f124bfd768

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