Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b62ad542e5ba9d2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 15:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8748115b1e825aaa46c2987166f6a1c5 SHA-1: 7ee83b6ae8411731f7a935b81e535e80c9adc619 SHA-256: 8b62ad542e5ba9d279e1dcc965bf41ee12aebfdeecb44815558b3ec54d0aede2
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. An embedded URI points to 'fokemale.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/award?keyword=two+letter+words+list+pdf PDF link annotation
    • https://cdn.sqhk.co/tirazirevemu/Lihjbr7/17647605362.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_defines_gospel_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459926/normal_6052cc79b8ae9.pdfIn PDF document text
    • http://shoplus.info/34245495670ez445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_602202022a706.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/ijaEbgg/the_banner_saga_trilogy.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/software_tester_jobs_remote.pdfIn PDF document text
    • http://woodbonus.net/nagodalezurosekutozarawodlg1m.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/what_is_aashto.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/can_american_wii_play_japanese_games.pdfIn PDF document text
    • http://domen3.club/vavebobawixuluwonibowuzmn.pdfIn PDF document text
    • http://raicen.com/beckhoff_hmi_engineerings04pu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa07c032-208a-470f-8cec-0d7aac0a0714/software_development_project_manager_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a77b138-32fb-4dc8-8164-eb39ccc4c590/cant_stop_wont_stop_p_diddy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89918b82-d122-42ac-a060-899220177a84/place_value_worksheets_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36d5e11-73d1-44d0-a27e-274b16ecb9d6/jojarufujuduri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292fa51c-59bc-4bf7-a7d6-0f7cf36fedc8/sony_rx10_iv_used.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/vomev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c07e14e-fc7e-42bf-a05d-13ebf4539782/quadratic_equation_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a5cd53-cfd8-4fd6-b674-c829a99191e1/52169751431.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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 4864 bytes
SHA-256: 1c47c23c7628831fa544f0a8b199f0bcfb37b45548da8e854f9ea6f0afa930d2
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 11308 bytes
SHA-256: 7026fbbab1514232bf472f06878f7a7cfbcb293e7ff8036f964621d8dfdb5ff8

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