Malicious PDF — malware analysis report

Static analysis result for SHA-256 991c7e64d3835579…

MALICIOUS

PDF

69.3 KB Created: 2021-02-26 13:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c2451f7bda1225f790a3ebff1b3de593 SHA-1: 5da3c8962cae22ac654b33726577b25772eb06bf SHA-256: 991c7e64d3835579108bd32ab3bb9c6fa8355520b8b8fb61d77b58815d0a7a5b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to 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
  • 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/wix?keyword=xtreme+brite+brightening+gel+uk PDF link annotation
    • https://cdn.sqhk.co/jarebomu/fijcjhc/96388028024.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/jdtgdhg/free_movies_and_tv_shows_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/NjaheHh/emergency_dentist_24_7_philadelphia_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/foJigTI/blood_glory_immortals_apk_offline.pdfIn PDF document text
    • http://natfreshik.fun/72192407531qfk2y.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/jpghQa8/50675353673.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/gwexgjF/world_war_2_b-_24_bomber_names.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/65160822517.pdfIn PDF document text
    • http://itawegan.space/71990434713nik9g.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/icmlgeI/julanowubapirivodoxuriruz.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/jgqhfgc/how_to_get_a_girlfriend_in_gta_5.pdfIn PDF document text
    • http://navaram.online/emperor_clock_company_model_300_seriesrqy18.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/ghLiijb/t_rex_chrome_dino_game_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_5fccc5606217c.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cen_tech_battery_charger_fix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/rilojanil.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 4892 bytes
SHA-256: a56dfcca27ed8d14962d5eb44778fc773d96e8be533fcd7289791722973e46d4
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10544 bytes
SHA-256: d0dacc26d3ff4ceb4b294bacea5780370710f092a31b9055c2625e03be6cc63e

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