Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6f2dc4a9b6ace3…

MALICIOUS

PDF

78.5 KB Created: 2021-02-18 17:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3346717a744bc82807521da64b0eceb3 SHA-1: 4b57ea67a1eef078936de4e11fcfa082583a81d1 SHA-256: 4c6f2dc4a9b6ace302d59b598740bdbfdc39a82ef4ae851b7989fb8a41712c06
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to 'windows vista activation key generator' and the authoring application 'wkhtmltopdf', indicating a potential lure for software-related scams.

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://leonvi.ru/wix?keyword=windows+vista+activation+key+generator PDF link annotation
    • https://cdn.sqhk.co/jefapukawore/YgixIhb/motorcycle_adventure_tours_british_columbia.pdfIn PDF document text
    • http://tabelib.iblogger.org/external_hemorrhoid_treatment_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5fcac4da1ab56.pdfIn PDF document text
    • http://vezadawebowa.iblogger.org/gay_lussac_law_worksheet.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/wallpaper_anime_android_720x1280.pdfIn PDF document text
    • http://kojovud.iblogger.org/all_black_platform_converse_high_tops.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/jxIRlgj/gogak.pdfIn PDF document text
    • https://cdn.sqhk.co/gejemizus/b8Df1hg/ripusutudupivimilewodi.pdfIn PDF document text
    • http://dilurijarejo.22web.org/darude_sandstorm_trumpet_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/ggedGGO/the_jackbox_party_pack_ps4_gameplay.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
    • http://pepuzizidokug.rf.gd/88832880236.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/avery_template_for_word_22807.pdfIn PDF document text
    • http://takerowul.epizy.com/proxy_switcher_chrome_free.pdfIn PDF document text
    • http://bisumige.epizy.com/custom_hats_no_minimum_order_australia.pdfIn PDF document text
    • http://katanitape.rf.gd/how_do_you_delete_search_history_on_ipad.pdfIn PDF document text
    • http://zopefunexot.epizy.com/cardiomyopathy_symptoms_merck_manual.pdfIn PDF document text
    • http://vofaxov.epizy.com/971524790.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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 5196 bytes
SHA-256: c1453d0395d0bdeea69f8230cd8ce59fcdf0692592d58ca52a3cddb0b139b1e3
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 10704 bytes
SHA-256: 549de0851ad3e83c6d781282d950cfba68abbc6b04a289af18cd45142a3c2b4b
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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