Malicious PDF — malware analysis report

Static analysis result for SHA-256 992e024f1657bd54…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 04:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9947d49e627fb92511918ae4888dc176 SHA-1: f1f8c2c6a6465b534ee4aed88119ef18d7498b00 SHA-256: 992e024f1657bd54f0200cce5c07ab45dc0e882600b54a9600aaf463b0a3ec4b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

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://jacksth.ru/strik?utm_term=blackburn+trakstand+indoor+bike+trainer PDF link annotation
    • http://esplus.pro/wemuwoxeruvemolomamixaifl.pdfIn PDF document text
    • http://lamatokatov.22web.org/42884940972.pdfIn PDF document text
    • http://all-system7.xyz/beat_tiles_rhythmatic_tap_apk6vjak.pdfIn PDF document text
    • http://a-trvl.ru/sivamupijak3o12.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/6gjghgh/killer_bean_unleashed_unlimited_mod_apk_download.pdfIn PDF document text
    • http://dufebomevun.22web.org/tinowakafufimopizimunidip.pdfIn PDF document text
    • http://leomannapov.com/cross_aldol_condensationb6bic.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/hjchjsJ/adventure_landing_st_augustine_prices.pdfIn PDF document text
    • http://fimobuzenetotij.iblogger.org/26449770091.pdfIn PDF document text
    • http://fasarolav.iblogger.org/how_to_set_up_swann_camera_to_internet.pdfIn PDF document text
    • http://cethq.xyz/mulesasupuvutum2sbl4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5fe99abde5ecb.pdfIn PDF document text
    • http://whitetwo.space/how_do_i_check_the_ink_levels_on_my_hp_officejet_pro_6978u2u32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevemaj.rf.gd/airtel_recharge_app_uptodown.pdfIn PDF document text
    • http://kebinuwozumen.epizy.com/9251545579.pdfIn PDF document text
    • http://waraposid.rf.gd/97434334577.pdfIn PDF document text
    • http://kivutivepew.rf.gd/folakusepadinakilo.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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5188 bytes
SHA-256: 6c2f24af3566af0de26a5b9a8cb6542bcf074f4e74cbdf1d9b79ac20e995f3f2
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 10860 bytes
SHA-256: ec9efaada3b0fafeb969478a0ef8d74de05ab80740254bf7d647efdc70cf183a

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