Malicious PDF — malware analysis report

Static analysis result for SHA-256 c969c0c9b6e8a5c9…

MALICIOUS

PDF

81.7 KB Created: 2021-01-26 07:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 976ee314d04fb480648ae00edad85f84 SHA-1: c93122372642479efc80b7086890022c7ad9f722 SHA-256: c969c0c9b6e8a5c9997fff86e86dca617aec07c20a2cc9d2f77891914f7b0310
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/123?utm_term=the+curious+incident+of+the+dog+in+the+nighttime+summary PDF link annotation
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/f45637471.pdfIn PDF document text
    • http://argo-tourism.com/world_war_z_2_release_datektcca.pdfIn PDF document text
    • http://love-cosmetics.shop/lowes_craftsman_tool_set_salezn52l.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/zuzigeletokosapekulotexb8e8j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_5fc79cc92139f.pdfIn PDF document text
    • http://santaparker.store/walukurubozoguburos614.pdfIn PDF document text
    • http://filemarker.store/spacex_starship_testrw3g1.pdfIn PDF document text
    • http://dronextactical.xyz/2xl_mx_offroad_hack_apk_downloadcy06x.pdfIn PDF document text
    • http://igme.site/60268066422p639y.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/zhfjz8r/descargar_move_to_sd_card_pro_apk_gratis.pdfIn PDF document text
    • http://floradoma.net/y8_games_bike_bmxmud3j.pdfIn PDF document text
    • http://xeeewq.xyz/soputodotewafoxewu4nyue.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/punamup-rejadowovitob-jizumuz.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/heja2H9/sad_ringtone_audio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 5456 bytes
SHA-256: 3cb88f3d38e765ae449c4ffbd844c3714f10c00f7cda41d06bc0151e61523657
font_01_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10568 bytes
SHA-256: a763e9dcccadcf26b2d38cfe2c68491772adcd00a992951140643bd7abe515fe

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