Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff47deab6c7a6137…

MALICIOUS

PDF

67.8 KB Created: 2021-03-20 10:36:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b78da8aab46b25a8a252710823dc85 SHA-1: d504b6d58d3de1c7fbed711fba22b0f4ea32ed22 SHA-256: ff47deab6c7a61378533c18656b78b5ab5bffd034b21842abe4ac731ce457b89
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

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://kuzutuzo.ru/award?keyword=las+mitas+en+la+real+audiencia+de+quito+pdf
    • http://freshka.fun/war_conqueror_4_mod_apkfqbkk.pdf
    • http://natosabi.mygamesonline.org/gobedakubolirixirisot.pdf
    • https://cdn.sqhk.co/giganopof/jbhbieU/wobasobadekevafenaz.pdf
    • https://cdn.sqhk.co/nuvuvidova/jcgjjjn/31408867100.pdf
    • http://yarrebitteh.online/fovurukalinuzufajotijuk0lx8.pdf
    • http://joloromodosafor.22web.org/nodajeluragu.pdf
    • https://cdn-cms.f-static.net/uploads/4409627/normal_601bd530701ec.pdf
    • https://cdn-cms.f-static.net/uploads/4410018/normal_603df0ca62036.pdf
    • http://zikuwojanubeg.iblogger.org/hallelujah_christmas_song_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jeximojela.myartsonline.com/zofobu.pdf
    • http://wenadudik.rf.gd/emotional_abuse_in_marriage.pdf
    • http://bikikifuxax.epizy.com/affidavit_form_in_zimbabwe.pdf
    • http://benamow.myartsonline.com/wuvewason.pdf
    • http://wokobunowome.epizy.com/chemical_kinetics_notes_for_neet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb77.bin
3e2fe4da81f6a1f402688ebbc31679280074d352e0830878d69978d2dc3b14ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 5368 bytes
font_01_sfnt_off0000dda3.bin
f254dfb4313cb4993addea05910eb428b01e6148e750e2f35838f6e1746713f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 11260 bytes

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