Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c92df38b78f37b6…

MALICIOUS

PDF

69.2 KB Created: 2021-01-20 19:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a491d913642392596f3992f2390dd98d SHA-1: d566c992e1029ccee0b98898333ef930eb97f467 SHA-256: 8c92df38b78f37b66b23696baa951ec6ccd6ab2733220d8226889c802e34f01f
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to downloading a game, suggesting a lure for malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=download%20game%20furious%20racing%20remastered%20mod%20apk In PDF document text
    • http://javoreruja.iblogger.org/warranty_vs_performance_guarantee.pdfIn PDF document text
    • http://jumazuke.iblogger.org/alphabet_cursive_handwriting_practice_sheets.pdfIn PDF document text
    • https://site-1168221.mozfiles.com/files/1168221/68378277444.pdfIn PDF document text
    • https://site-1173632.mozfiles.com/files/1173632/colors_of_the_rainbow_in_order_song.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/0ievCjd/black_friday_tv_deals_2019_uk_43_inch.pdfIn PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/araba_oyunu_indir_apk_day.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/iiMhehe/34193154583.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/jUhahcz/battle_stick_dragon_tournament_legend_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/IjjigGK/color_balloons_images.pdfIn PDF document text
    • https://site-1172834.mozfiles.com/files/1172834/pewdiepie_tuber_simulator_hack_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xapimiwosusuv.epizy.com/febrile_neutropenia_guidelines_2018.pdfIn PDF document text
    • http://fuvezijejek.epizy.com/95970726105.pdfIn PDF document text
    • http://gawuvuv.epizy.com/shein_size_guide_uk_18.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/mapomipe.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/algebra_worksheets_for_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/insurgent_movie_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/android_or_ios_development_reddit.pdfIn PDF document text
    • http://taruxapajosavup.epizy.com/societe_generale_marocaine_de_banques_annual_report.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_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 5632 bytes
SHA-256: 1db8b9d7ecf60dbe53499f618132f0c4200ef8a0c862fc43f1d90f9ffe2e228a
font_01_sfnt_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 11268 bytes
SHA-256: b8e15a39866288bde7dd5eca07372767623d8156a09dc54cd7dcd3f841bd8b1d

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