Malicious PDF — malware analysis report

Static analysis result for SHA-256 51eeb1b117280bc9…

MALICIOUS

PDF

74.9 KB Created: 2021-02-26 06:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5c2d21696f62e0178cb461a08b433529 SHA-1: 4d61c3b16c79400dd266e4a6af3053af8f692ced SHA-256: 51eeb1b117280bc98a11520f83c7ca43cc34923b437b477396eb5e121e0c578d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm or SEO spam operation. The embedded URLs, such as 'https://leonvi.ru/strik?utm_term=how+much+oil+does+an+ariens+deluxe+24+take', are likely used to redirect users to malicious or spam content. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+much+oil+does+an+ariens+deluxe+24+take PDF link annotation
    • http://tonerinkstore.com/57000008708pj4fx.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/wisepogiled.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/98289e721e5.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/putorow-wivove-pemadejavoriwa-bidixonilex.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jcgdgcC/the_farmhouse_menu_americus_ga.pdfIn PDF document text
    • http://experiment.website/weather_underground_seattle_hourly0371o.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/death_note_ryuk_voice_actor_english.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/b60eb56.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/jb0Ygjc/how_to_raise_a_kid_book.pdfIn PDF document text
    • https://dafuzimobolu.weebly.com/uploads/1/3/4/4/134498283/muzebetud.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/jZRmihs/royal_caribbean_cruise_ship_news_today.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/bedemexekamatesuvaguga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/tufukapuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/6572770827.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/vixelidemoxojegusixad.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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5584 bytes
SHA-256: b058f272962f3bb29fe61ba7e9321310514c94b462251c5124f091f051144a97
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 11024 bytes
SHA-256: fa79e1d4ab21a6f376a1422dcf2ad52a5a997bbd289cfea31ece6852af3e5520

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