Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8a196ef639d1db…

MALICIOUS

PDF

78.2 KB Created: 2021-05-16 07:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a220e6f23d4cce05501dc90d291888e SHA-1: 77528f9e9531efb4458cfb3d629a225af45e4398 SHA-256: 5c8a196ef639d1db553352b91c6ef448148523ac1bbc99056940b16846fce016
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body, though truncated, contains a reference to 'The crown season 3 episode 8 fact check', likely a lure to attract victims to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=the+crown+season+3+episode+8+fact+check
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/22cb9.pdf
    • http://gelupulofevabek.medianewsonline.com/gegezezogejewesorixumep.pdf
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/nejime_vakoluridepor_bazogotosiberuv_zekusebegifak.pdf
    • http://xujadawowupu.scienceontheweb.net/bcs_theory.pdf
    • https://cdn.sqhk.co/perekowemo/ahfW3gj/98148095728.pdf
    • http://xatovapotogu.mywebcommunity.org/tovaxisisofigumirozo.pdf
    • https://cdn.sqhk.co/xenivoronizu/zibhbOW/counter_terrorists_win.pdf
    • http://basumoxivor.sportsontheweb.net/adaptive_leadership_model.pdf
    • https://cdn.sqhk.co/satovepato/D1gfT8y/luxesil.pdf
    • http://povisowalikim.scienceontheweb.net/introduction_to_autocad_plant_3d_2020_free_download.pdf
    • https://cdn.sqhk.co/fatepotax/dHijhfY/turbo_racing_3d_mod_apk_pure.pdf
    • http://sufofure.mywebcommunity.org/57189824988.pdf
    • https://cdn.sqhk.co/sotisibu/ieVghxp/96986709619.pdf
    • https://cdn.sqhk.co/jomawutid/ajeZghc/wolfquest_2._7_pc.pdf
    • https://cdn.sqhk.co/rirexiwudag/eBMjixJ/why_is_my_followers_app_not_working.pdf
    • http://zavulibalox.mypressonline.com/html_file_to_linux.pdf
    • https://cdn.sqhk.co/gegenosuzun/b6jhibB/26963356541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duwemanuwixam.atwebpages.com/printable_board_games_to_learn_english.pdf
    • http://widifusi.myartsonline.com/24659284084.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_off0000f0fe.bin
c74a4e3b4a9156e550ce6e336a5db9863e236fb11949e4811c896925a4ea0872		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 5676 bytes
font_01_sfnt_off0001045e.bin
9cc80c3d00ffb1fdfa6ad2375fa680ce7d20bb2ee7eba031e8a17e1c60f63b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 11000 bytes

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