Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cafb046f0cafe5f…

MALICIOUS

PDF

84.1 KB Created: 2021-03-23 01:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d5d30ad3fa53b48f075214b10f7b2d4 SHA-1: 5a6c47fb95b70ba57eaba60d8e1a064fcec69330 SHA-256: 6cafb046f0cafe5f524c30fa955d628051a866c5784510203a930828caec731d
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://xajibur.ru/strik?utm_term=generic+structure+of+report+text+dalam+bahasa+inggris PDF link annotation
    • https://cdn.sqhk.co/gobajejuz/ijVrhfR/loudoun_county_public_library_cascades.pdfIn PDF document text
    • https://cdn.sqhk.co/juvokapo/8hhfbjb/98972177198.pdfIn PDF document text
    • http://raxejag.22web.org/zoligetimaf.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/cauchy_euler_equation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_6014d79a43de5.pdfIn PDF document text
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/pelarowiturusofuji.pdfIn PDF document text
    • http://faporivifavavep.22web.org/inequalities_on_a_number_line_worksheet.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/sociolinguistics_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/ojdRsjj/9703883732.pdfIn PDF document text
    • https://cdn.sqhk.co/kedetofido/RWjb5am/42934463387.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/31149101105.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/jhnodie/6678144800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6010c74bcdc3d.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/titajazame_gezenirex_wujasavotiwudan_fepemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_806a999bcd0647f08793a8f29743d757.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/nufajurar.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_baf76fc7687042b0ba12149a3da6c598.pdf?index=trueIn PDF document text
    • http://diguluzid.epizy.com/who_is_italo_calvino.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_5a42ee6a59af47c88f097a662174707e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 5808 bytes
SHA-256: eb452cea6140e9efb09ef5003963f374a610177a8a08b11468af2340bdcde68b
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10608 bytes
SHA-256: eeee772a02330fee3ea1aa47b1647b838906d6665a980de9d49eadb3fd1568a8
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e