Malicious PDF — malware analysis report

Static analysis result for SHA-256 147dd11eeb70eeb2…

MALICIOUS

PDF

74.8 KB Created: 2021-06-12 04:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f0afe8f6f0fe28e55b0ed7113567d489 SHA-1: 1734edbb883272ae8f435d9981b06eb8f5c6eec6 SHA-256: 147dd11eeb70eeb2379d0617e01aa8d69ed73a7d586b9db340eb9f5fb05929be
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting and are part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, and the ML classifier and ClamAV detection further support this. The primary IOC is the URL 'https://synerhu.ru/pbw?utm_term=how+to+beat+simian+flu+on+normal', which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

Heuristics 4

  • 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
  • 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://synerhu.ru/pbw?utm_term=how+to+beat+simian+flu+on+normal PDF link annotation
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/resaberasikoj_xewixiramisov_wolovawivor_budodagase.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/bugotopolefefarubegi.pdfIn PDF document text
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/30acfb19325.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/616200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144427470/how_to_make_a_school_calendar_on_word.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413583/crash_bandicoot_3_psp_iso_download.pdfIn PDF document text
    • http://nonesupul.pbworks.com/w/file/fetch/144662460/planos_de_instalaciones_de_gas.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144810357/import_sketchup_model_into_blender.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/f/atp_at_205_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5855bb15-9a7e-4560-8b07-563e667fd4bd/man_killed_woman_in_mandeville_jamaica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfc47aa-24c4-4ec6-9ba5-333cee2b7936/agilent_1100_hplc.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144603234/53338664813.pdfIn PDF document text
    • http://suzojadek.pbworks.com/w/file/fetch/145142085/gibebijofuxidobaxinowe.pdfIn PDF document text
    • http://rabumofu.pbworks.com/w/file/fetch/145038729/download_mini_militia_mod_jetpack.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/is_there_romance_in_shadow_and_bone_show.pdfIn PDF document text
    • http://wafijovodek.pbworks.com/f/kuzegexalibenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2a99d6-d2bf-45f8-8c67-a3d71787b96f/metro_employees_credit_union_routing_number.pdfIn PDF document text
    • http://sulegiwi.pbworks.com/w/file/fetch/144621456/empirical_formula_worksheet_1_answer_key.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/bemivovebezejipe.pdfIn PDF document text
    • http://voveras.pbworks.com/f/cracking_csat_by_arihant_publications.pdfIn PDF document text
    • http://lovixov.pbworks.com/w/file/fetch/144953550/rikifipikenez.pdfIn PDF document text
    • http://kemuxin.pbworks.com/w/file/fetch/144678456/what_is_bpo_chat_process.pdfIn PDF document text
    • http://virakijib.pbworks.com/w/file/fetch/144961242/hsk_standard_course_1_workbook_answers.pdfIn 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_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 5108 bytes
SHA-256: 46b69874da4033619f0472c4e3d6862ffb050af761c99cd1938549689e062ae8
font_01_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0

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