Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7b6139fabc2f78…

MALICIOUS

PDF

71.8 KB Created: 2021-03-11 19:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d333141adee7d8ef35807c791c12ee9e SHA-1: 5a8b8b016ec9d7f4164c0b698e3a77d8771d907e SHA-256: 8d7b6139fabc2f78338e51ea42673acbe638054c9a33305f7bec37e1922e685c
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/123?utm_term=blacklist+mein+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492245/normal_60089efee92dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_60406b917da9f.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/Naqihih/change_eye_color_photopea.pdfIn PDF document text
    • http://everydayy.fun/paraiso_travel_descargar_completozk0xu.pdfIn PDF document text
    • http://usejus.club/free_esl_worksheets_for_elementary_studentsv7y6o.pdfIn PDF document text
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/kiwifepokelegip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5fe87c1b06061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fd700d67bceb.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/bzMidP3/pool_trick_shot_games_online.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/kudewedudupoba-tetoxobifazis-lipemus-ripazuwaz.pdfIn PDF document text
    • http://reznitskygallery.com/81522872118nvt6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_6035422bed3b5.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/werajutodabogifoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_601b4b1ccf076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_601b1a45bdb28.pdfIn PDF document text
    • https://vikabedegopeve.weebly.com/uploads/1/3/0/8/130874339/4041556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_60184caab5cdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423460/normal_5fef3a358a226.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/6935358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5ff1e1267bda2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowovenali.epizy.com/76811965217.pdfIn PDF document text
    • http://maligufaribez.epizy.com/a_que_hora_se_reza_el_rosario_de_la_divina_misericordia.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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 5200 bytes
SHA-256: 9e4de266a5130e7fb642974372173afde28eaf378eeb8f92c24bac4a7a6aec6b
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 9692 bytes
SHA-256: 9932c2c1b983759b97688b57d6adb1a6b581a41ae25165e2a448332e964e0b5c