Malicious PDF — malware analysis report

Static analysis result for SHA-256 386b1b383e96ce6a…

MALICIOUS

PDF

83.0 KB Created: 2021-03-10 18:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 27a077f63726f6533cb05a6a55e3e484 SHA-1: 956fc3c934828a85de161fe003b1f4d7d2aeea56 SHA-256: 386b1b383e96ce6a3a2ea99f939ea2c1ad2f91ccba015768fb638aed3f852545
186 Risk Score

Malware Insights

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

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 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=foxtel+tv+guide+tlc PDF link annotation
    • http://ttop-shop.com/9337270829upxjr.pdfIn PDF document text
    • http://heliusdesign.ru/houghton_lake_mi_snowmobile_trail_reportmyq6r.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/95877778296ybz77.pdfIn PDF document text
    • http://pigokakiw.iblogger.org/descargar_biblia_de_estudio_diario_vivir_gratis.pdfIn PDF document text
    • http://dreamingdeveloper.com/prometheus_unbound_stargate_cast4w8wv.pdfIn PDF document text
    • http://raisinslabs.club/standard_calibration_curvelv37m.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://bejopirobi.epizy.com/what_is_the_salary_of_a_medical_researcher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7c777b-a92c-40be-a7dd-b74954cd48de/sofowuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1552876-87e6-4242-bdeb-5307925ded7f/how_do_i_update_my_audio_drivers_windows_7.pdfIn PDF document text
    • http://kitasiru.epizy.com/diy_mickey_mouse_ears_template.pdfIn PDF document text
    • http://tudozujuxijoz.rf.gd/how_to_fix_a_kenmore_washing_machine_timer.pdfIn PDF document text
    • http://zisilorelane.rf.gd/64123674569.pdfIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_8267658601be4234bc956efc70228a73.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_fb3f10b52c45434fa20fa38a3ef81ee6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fc7fe4-68a2-4f49-ab8a-c95a2c56d363/81425727475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8e26db-6bee-4d2e-9da9-b276541faaf0/bigomivuxe.pdfIn PDF document text
    • http://gigezevozaf.epizy.com/48274844958.pdfIn PDF document text
    • http://gasukexopesifu.epizy.com/2803366545.pdfIn PDF document text
    • http://kixazogegome.epizy.com/casio_fx_95_es_plus_manual.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_3884fb3c53dc410cac70004996f2b390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0602dabf-2f59-4ca0-862f-da9792e957aa/lush_essential_oils_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980b1e32-b5a3-4ca3-86d4-a3e7dc958d78/17075817993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729b829d-05a1-432f-9cb9-ea53e246aff3/kenmore_water_softener_installation.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_c060878b6c514aec8c02dc985709aadd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 4484 bytes
SHA-256: 2adeccc1338ba60d59a7d324f618811fd0f942982147aff0f4ca1e5954c86ad8
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 12668 bytes
SHA-256: d4c05d4b6b3643166cd748b55413114a2c3fdf144024fc7cdd7245139b575feb
font_02_sfnt_off0001301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230