Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27d7ae765547155…

MALICIOUS

PDF

75.1 KB Created: 2021-04-02 05:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c50423ea8089264f04456e98dca3ae47 SHA-1: 3761dd7bb700a864737a2c6e96b3da24c006a7be SHA-256: c27d7ae7655471559d0ddecc08e69171496ae343139a72cbdc7eaa97c48b78c8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pelibifir.ru/strik?utm_term=health+and+safety+policy+example+care+home PDF link annotation
    • https://cdn.sqhk.co/vafodagusun/eyWgjhj/board_games_for_5_year_olds_walmart.pdfIn PDF document text
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/tunujul.pdfIn PDF document text
    • http://filfex.ru/joseph_coat_of_many_colors_coloring_sheettke4z.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/nodinebu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/fijjjjg/granny_chapter_two_mod_apk_latest_version.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/star_wars_lost_stars_characters.pdfIn PDF document text
    • http://ig-mediateam.net/edit_email_template_outlook_2013kmbvs.pdfIn PDF document text
    • http://mubositesene.mypressonline.com/time_series_data_analysis_using_eviews.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/nj_transit_bus_schedule_163_164.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/igPNojh/pico_de_gallo_translate_into_english.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/fesibesalewarex.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/1510477.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/jqhcNha/96318308552.pdfIn PDF document text
    • http://shtancircul.site/26259816621xx852.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/ejiye5j/lolanaxubowimuse.pdfIn PDF document text
    • http://verenica.net/osmosis_and_plasmolysis_lab_answersfioyq.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/5944995.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/wonobolik.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/jhh7mvx/gravity_bong_socket_size.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dionico/hello_yo_free_voice_chat_rooms_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/SGKhagC/asmaul_husna_latin_dan_arab.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/imAGgdk/what_does_catfished_online_mean.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/fa349fe3fe452.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/centrales_termoelctricas_de_biomasa_libro.pdfIn PDF document text
    • http://ketotreno.buzz/102105326910ma1u.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://roporuti.onlinewebshop.net/74688394286.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/how_long_to_see_results_ab_exercises.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 5316 bytes
SHA-256: 0ee4e77a35098b9772a5a6f656c1d3c982510edeaeea9468cb53049554364dfc
font_01_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 10872 bytes
SHA-256: 5ff11155004ad2c27058fb4b92054e95a6de33bd6dc31edf45eea855fa71466c
font_02_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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