Malicious PDF — malware analysis report

Static analysis result for SHA-256 6598b3d3c6b85c6c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-03 15:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 91bec8be6489f3511098a1650bf0bb89 SHA-1: d90ada17018c6b8e257107a09bef69314c169aff SHA-256: 6598b3d3c6b85c6ce4846583174cdf7c031a653411a264419b0664dd988f1c6f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/123?utm_term=is+tom+clancy+breakpoint+cross+platform PDF link annotation
    • https://cdn.sqhk.co/jugomuzuteb/idjbgje/51412971182.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/pifHjfo/62025336373.pdfIn PDF document text
    • http://jasubizajimalep.iblogger.org/51018415710.pdfIn PDF document text
    • http://bivasezi.iblogger.org/china_map_vector_image_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/hcjihf5/pegepolugijuwulawutivewad.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/9FYxNAV/dragon_mania_legends_hack_tool_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/iliduid/how_to_draw_plants_vs_zombies_garden_warfare.pdfIn PDF document text
    • https://cdn.sqhk.co/varaxupumami/SRvE7ZG/36795425001.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/evhe2je/pinball_wizard_lyrics_taron_egerton.pdfIn PDF document text
    • https://cdn.sqhk.co/gozafavapawu/ghgeWih/icy_hot_patch_side_effects.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuminatunajovop.epizy.com/shampoo_bottle_design_template.pdfIn PDF document text
    • http://tolokob.rf.gd/bfg_new_film.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/building_maintenance_management_system.pdfIn PDF document text
    • http://pibanifadedo.epizy.com/oru_moodan_kathai_sonnan_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/begarovitirajisexajige.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/electrolysis_process.pdfIn PDF document text
    • http://kenukune.rf.gd/78116274551.pdfIn PDF document text
    • http://baniteb.epizy.com/siwerevokubukuzofaxamujof.pdfIn PDF document text
    • http://kedokonox.rf.gd/10144765260.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/auguste_comte_sociology.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 5404 bytes
SHA-256: 93f4c18f0663a44d8782e4abca32c88c571d448d642e0591567369e1399e27fa
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10996 bytes
SHA-256: 34fa4d160fc8a80096d12956b498b9580315cdcee8d46c3539a398a6d6106484

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