Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bc1266d70d7b52…

MALICIOUS

PDF

79.9 KB Created: 2021-06-09 05:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 84f33ece40672a8504acc07634ca56d2 SHA-1: 2101012b6079176be9d9d98c47c74961ec744989 SHA-256: d1bc1266d70d7b522db8b4bdf639a907fa5c25841af37863648a5902a093af05
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 5

  • 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://mezovuduw.ru/123?utm_term=aprendizaje+auditivo+pdf PDF link annotation
    • https://barufaworu.weebly.com/uploads/1/3/5/9/135957986/80f515e80cde07a.pdfIn PDF document text
    • https://vozabamoz.weebly.com/uploads/1/3/5/9/135959881/vobasimepu-juxine.pdfIn PDF document text
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/7753853.pdfIn PDF document text
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/lezezukez.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/2fb3895a.pdfIn PDF document text
    • https://bagonapibuvuxo.weebly.com/uploads/1/3/0/7/130738628/3163714.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/5078b24.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/4157845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dagomiwavi.pbworks.com/f/marvel_avengers_academy_download_2020.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144501780/how_to_get_auto_clicker_for_roblox_no_download.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144684510/vpn_for_pc_free_download_windows_10_64_bit_with_crack.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/best_practices_for_cold_calling.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144540849/rokuj.pdfIn PDF document text
    • http://daridameku.pbworks.com/w/file/fetch/144768711/research_proposal_format_download.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144420981/56031541663.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/w/file/fetch/144684261/noam_chomsky_language_theory.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/we_can_be_mended_free.pdfIn PDF document text
    • http://kivupored.pbworks.com/w/file/fetch/144485619/talojufurojirotuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f24ed3-e8e7-4a28-8630-27bc9db77f2c/tegidutokovikonopuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af25182-6026-46c2-9b3a-49ebd6520470/how_much_does_a_kubota_svl95_weight.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/aarp_member_sign_up.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/f/tugabonigeluratanuwixeme.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 5000 bytes
SHA-256: cbe521d456798a7ef5a24ca5e9537b7b79b48bc613028eaa5ee970ad9ff14be8
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 12012 bytes
SHA-256: 1b2b4ff873b6505cd17c32c52529f0543b46ca49796b24e271b2b1173a04d541

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