Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf66a92ed2534f3…

MALICIOUS

PDF

82.8 KB Created: 2021-04-18 07:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118aa089d732ac5eaa168ef70de79fff SHA-1: 774cd3864c90abbf2beafe9ccaf433c20208a857 SHA-256: eaf66a92ed2534f35044f6efc1df78d754b49ac5a21aa86e53b699e3ba71e6a4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to domains that are either unknown or associated with disposable hosting, suggesting a tactic to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=edgar+schein+organizational+culture+and+leadership+3rd+edition
    • http://gamedv.design/der_bergdoktor_gerhart_lippert_episodenguide4mehv.pdf
    • http://fajujefa.getenjoyment.net/diary_of_a_wimpy_kid_show_cast.pdf
    • http://brumbum3.xyz/ms_project_2019_download_64_bit_with_crack66hmx.pdf
    • http://impergamon.com/microsoft_project_pro_2019_crack2irj7.pdf
    • http://onlinekartiadesi.com/partes_del_termometro_de_mercurio15paf.pdf
    • http://ketadiets.site/what_color_is_honda_transmission_fluidatret.pdf
    • http://erkutungotu.com/4404875891710vu.pdf
    • http://getsalle.xyz/xafedonevalokiscx5b9.pdf
    • http://ygrash.website/xiduduzh55z.pdf
    • http://theandyhong.com/nakebibituzuwapuvozuzisrsn9p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d9e2345-f187-4a14-b551-2c9497ded44a/56605488774.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_b81464d1ff4442c5ad091e082ea6e19f.pdf?index=true
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_c6302963c0ce495f864ff82cec11ddfe.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_2151202ca7814e1d9bc341240aeb6bae.pdf?index=true
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_49676e0de38741dcb02d9ea3c60e0d1b.pdf?index=true
    • http://gekolutewubel.myartsonline.com/acid_base_chemistry_ssc.pdf
    • https://uploads.strikinglycdn.com/files/b2a83bbf-7c71-4411-8f8d-8bf24476c8d8/what_does_the_lowrance_3_in_1_transducer_do.pdf
    • https://uploads.strikinglycdn.com/files/82ca8d05-558e-470d-8c3b-a87b49ef2dd0/what_if_netflix_season_1_summary.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_c825c6b4ee9b4ece84981dfa9d194fff.pdf?index=true
    • http://sajoveguduv.onlinewebshop.net/fundamentals_of_computer_graphics_fourth_edition.pdf
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_aa625a3bc18f47c18d6a95749f343a0c.pdf?index=true
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_016d5eba8ee84b15a32e3ba2568eeadb.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_f032f910694443ccb7cbcc23ede13007.pdf?index=true
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_eaea11359af441dfbaf27bc0df8c11cf.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f900.bin
a4f26f3ea779f0a904c0d70e8ad1f6646e911c643aeb1a64974917bb0c53dd65
pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 5504 bytes
font_01_sfnt_off00010bc8.bin
be42d40f53e7cd46a34f8c817ab908b67a43251ce16b2dc3a9b39ce2dcd0b1f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 15732 bytes