Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bc2bc832ebf0a9…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 10:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 050e66d8f8996dd2d3aea10c4a5350c4 SHA-1: 8a826f584cb80f2ec4992a33d3de3ea5a23889a7 SHA-256: 39bc2bc832ebf0a9b48a5be74e1e4b5815283dfa6006e8d521c2e7839ff743e1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable hosting and known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=arkansas+next+scavenger+hunt+answers+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_602a46270b41a.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/xcore_hunter_no_ac.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/89917308888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5ffd3b60671de.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/paea_eor_family_medicine_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_60244e7ab009d.pdfIn PDF document text
    • http://hackins.site/equilibrio_rotacional_ejercicios_rest9za1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456369/normal_6005297aad714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff0ca3987bad.pdfIn PDF document text
    • http://businesshelpservice.com/libros_de_mecanica_del_automovildjx7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_601bf8f546169.pdfIn PDF document text
    • http://mizigigutafax.iblogger.org/dual_antiplatelet_therapy_guidelines_2011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_60143ff066178.pdfIn PDF document text
    • http://vandify.com/mr_coffee_bvmc_knx23_user_manual9g8nt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_602dccc3c4db1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lumigetutiburu.epizy.com/bharat_telugu_movie_songs.pdfIn PDF document text
    • http://xenavak.rf.gd/simple_trig_equations_worksheet_answers.pdfIn PDF document text
    • http://viladanus.epizy.com/template_cv_bahasa_indonesia_yang_menarik.pdfIn PDF document text
    • http://sedilar.rf.gd/uc_browser_untuk_pc_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 5300 bytes
SHA-256: fdc80da711cb9a531dcdc85daf75dc7626c6e13504d1c54419c7f5404386371a
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10268 bytes
SHA-256: 2aceed80de354ef4bc08d71837cc1e8fe486813482ab63933a5e78ccccff71fe
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 16100 bytes
SHA-256: f12bcc42cb143e9cc41a08ef9f9c81c8a36c017982c073a20263204097028d61
font_03_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333