Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d34d27ae0fc4df…

MALICIOUS

PDF

64.4 KB Created: 2021-02-22 14:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf6dc09147d6f623d29366da4b711142 SHA-1: 30c593e718544b2277f340e3fb4332943cec2de9 SHA-256: 11d34d27ae0fc4df5649fe8e7cafcaecd01e200f89fed21f84246e5104d02ab2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links pointing to various domains, indicating a link farm or phishing lure. Heuristics identify it as a link farm on disposable hosting and a malicious PDF. ClamAV detection confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/wb?keyword=brother%20p%20touch%201750%20tape PDF link annotation
    • https://cdn.sqhk.co/rizakumer/ggieiLB/broadway_play_i_remember_mama.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/JOu8ghi/call_recording_app_for_iphone_xr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5ff790884aa54.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/iitNZ3V/8_ball_pool_hack_2020_dinheiro_infinito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5ffd681ee03ed.pdfIn PDF document text
    • http://bilkan.fun/feedback_sheet_creative_writingpnh6l.pdfIn PDF document text
    • http://lg-copyrightforms.com/world_camera_live_apkwhtck.pdfIn PDF document text
    • http://sewasapeko.22web.org/28890805235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_602d31003a160.pdfIn PDF document text
    • http://ideal-it.fun/crystal_reports_sp21_for_visual_studio_201729ktm.pdfIn PDF document text
    • http://maximizator.xyz/57763425739m4k2x.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/gejgnGm/halloween_party_costume_ideas_college.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/YvK0eo2/falling_in_reverse_drugs.pdfIn PDF document text
    • http://espaceabonnes.com/225092990580oe6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_601e2d904f64f.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_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 5256 bytes
SHA-256: a205a45fe1047b596be00f562d7539f2df3173cca37b1d5506658c4275d702fb
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 10368 bytes
SHA-256: 1563006a2d8df7b572b67c680707fdf993c218580765f26e78acc279e1994811

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