Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b8bf47af2ca79d…

MALICIOUS

PDF

78.0 KB Created: 2021-02-27 18:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 775e9478b7d10f53d3b9bddb09adea4f SHA-1: 4580673268a0be2f90a78712f2d0edc77616febe SHA-256: 66b8bf47af2ca79da40db992eb9f44d0bfd61c81d9ab7bcc19b7758ca581d576
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true malicious destination. The document body, though heavily obfuscated, contains text related to 'Past future tense definition' and mentions 'wkhtmltopdf', suggesting a lure document. The presence of embedded URLs indicates an attempt to redirect the user to a malicious site.

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://baarspo.ru/wix?keyword=past+future+tense+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5ff5b35f36848.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/2950883512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_603337299cb62.pdfIn PDF document text
    • http://medtechnika1.ru/xujalajanaiuy0q.pdfIn PDF document text
    • http://klosheff.xyz/kewojebunivebavbrypy.pdfIn PDF document text
    • http://wuzagabi.22web.org/the_founder_movie_guide_questions.pdfIn PDF document text
    • http://theboldpantsproject.com/ielts_speaking_academic_questions_and_answersjast6.pdfIn PDF document text
    • http://dasuwupozu.22web.org/delonghi_space_heater_1500w.pdfIn PDF document text
    • http://montana-media.com/shooting_showdown_2_apk4z0o9.pdfIn PDF document text
    • http://fb-copyright-help-from.com/topizifaxogitexukekarts1m.pdfIn PDF document text
    • http://springwin.space/3d_gif_animation_software_free619u3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481170/normal_5fe2a73a2c8ee.pdfIn PDF document text
    • http://vsedlyatebya.xyz/candy_crush_soda_more_levels491pw.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
    • https://s3.amazonaws.com/jonora/mevagipujimisoselozex.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/layout_border_radius_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/bloody_roar_3_mod_apk.pdfIn PDF document text
    • http://famuruvif.epizy.com/60231984912.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 4752 bytes
SHA-256: 25468f66020c568af11a409d0adf79729800d93905b02f174902c1bcde0274f2
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 10520 bytes
SHA-256: 4a545116522e701c59b4e0ac430d640701af9c10be1e8516e04ff23eebd75d38
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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