Malicious PDF — malware analysis report

Static analysis result for SHA-256 9562bdd740d23982…

MALICIOUS

PDF

87.2 KB Created: 2021-04-03 19:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 28d1101a77fde43f3579ffe6c9127e39 SHA-1: 23c89cded737a4981f23bf5ce673e0339d284e3c SHA-256: 9562bdd740d23982fe2129336fa682a81e765dbe77a34fc000daa7117d37a457
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vilenefex.ru/wix?keyword=recycle+triangle+numbers+meaning PDF link annotation
    • http://lisolu.org/asus_rt-ac66u_default_wifi_passwordtkz0m.pdfIn PDF document text
    • http://ceter.xyz/lebaladumuvejotowurajibejtbf2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_604b809cc6fa0.pdfIn PDF document text
    • http://motuxagajoweji.22web.org/construction_project_manager_salary_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_605f003dbcf2c.pdfIn PDF document text
    • http://harkateine.fun/98071721530yx4f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_602e391ebc429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fe6c7ab712e6.pdfIn PDF document text
    • http://nubuweso.iblogger.org/monitoring_and_evaluation_officer_job_description.pdfIn PDF document text
    • http://gulibej.22web.org/joperupipalifeposonob.pdfIn PDF document text
    • http://trylait.club/92785942897brjok.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/grokking_deep_reinforcement_learning_githubgldcl.pdfIn PDF document text
    • http://lodexigu.22web.org/cardiomegalia_global.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_6067d058573e7.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://ig-soft-team.com/numumutogivipalekugogaxhfh4e.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://xiwezolemamu.rf.gd/53030499976.pdfIn PDF document text
    • http://wujidazigobad.rf.gd/appsense_application_personalization_templates.pdfIn PDF document text
    • http://zevuvedov.rf.gd/caracteristicas_de_un_algoritmo.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_dd54b60fec814edd82190500fd55c3de.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_5224b508d3434f08bd88c16d915a7021.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_e4b1072d6bcd45969c985b2e7a556afe.pdf?index=trueIn PDF document text
    • http://vuxonisozezuxov.rf.gd/iss_financial_report_2017.pdfIn PDF document text
    • http://tojozojorezew.epizy.com/62007722581.pdfIn PDF document text
    • http://gisipusizen.rf.gd/capacitor_colour_codes.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_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5140 bytes
SHA-256: cb9d2f97e7a4e680a46d663d75aa89f8afba8b2019b136bd715c9adb9ba1022e
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 10744 bytes
SHA-256: 023860a613c63ee10adc09179fb7fb7bd33a9462afeb39aa346418180a9d6ace
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3