Malicious PDF — malware analysis report

Static analysis result for SHA-256 240624696c7ea5fe…

MALICIOUS

PDF

73.4 KB Created: 2021-06-04 23:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6668619c3ae7c66c5e0cff68a5d3412e SHA-1: 100f49afc2a74a941f5e33bc2217a56a677ed093 SHA-256: 240624696c7ea5fedfe24a7a16b374cd21108282d501ff30905460ed8e301064
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 0.9995

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://dafemum.ru/123?utm_term=management+of+chronic+heart+failure+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375531/normal_5fdfcc2fbd8b8.pdfIn PDF document text
    • https://risidetumul.weebly.com/uploads/1/3/4/3/134320066/fawulopelike.pdfIn PDF document text
    • https://divopugizupuja.weebly.com/uploads/1/3/4/4/134487222/befimarewuwapo.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/c0794ed2.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/xukifureziz.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/5611383.pdfIn PDF document text
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/zexisotezi-xoduxetunijizor.pdfIn PDF document text
    • https://feriwixuwegixuf.weebly.com/uploads/1/3/4/6/134602873/giferaxupikobi.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/wuzomogokanadev.pdfIn PDF document text
    • https://wasafigazepez.weebly.com/uploads/1/3/4/5/134586721/lofulupalol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_600fe5e563ed4.pdfIn PDF document text
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/rasiluxig.pdfIn PDF document text
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/pugajulexarisub-kurofiwe.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/fonamubudabefozube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_60678a7062f2f.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/gagoramajubatowope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144466410/kva_yaynlar_8.snf_matematik_soru_bankas_cevaplar.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424209/how_to_forecast_cash_on_balance_sheet.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/how_can_i_find_a_name_to_a_phone_number_for_free.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144415641/what_is_vrv_air_conditioning_system.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/nogaludaluv.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144604278/roblox_btools_hack_pastebin.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_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 5440 bytes
SHA-256: d86c0f62860de1ba2217b60c3c578a68d973fe7f050ca2772ebcfbfdba67d516
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10176 bytes
SHA-256: 5f1860c6888a3aad35feb3640fdbafc42f9829367199ae84a2bf9832a4d52c11

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