Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b18edeef834178…

MALICIOUS

PDF

72.6 KB Created: 2021-03-11 19:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 638337b2896c44cf2b39511df5e52ed8 SHA-1: dc0a91becab1e39120465c4499c09152835c3eb9 SHA-256: 05b18edeef8341784b66d3c106c3a9f490bc097ff95ea5c4606665c77cf6f3f5
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a high concentration on disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=high+frequency+words+5th+grade+worksheets
    • http://jujasoje.iblogger.org/find_and_delete_duplicates_in_google_sheets.pdf
    • http://mnclassis.org/pevusigagoba4f2qa.pdf
    • https://cdn.sqhk.co/bitizulokiva/8Abibih/69103586528.pdf
    • https://cdn.sqhk.co/mutexeze/aTe7jfh/apa_guide_citing_website.pdf
    • http://topukovatawosu.sportsontheweb.net/how_to_replace_kenmore_dryer_belt_90_series.pdf
    • http://eurosett.net/levib4yw6p.pdf
    • http://itawegan.fun/mirijomoriwaropobexdjzk.pdf
    • http://lupelisizi.medianewsonline.com/66188646460.pdf
    • http://kutegexuwudaro.getenjoyment.net/67082323780.pdf
    • http://fisujerekuvij.getenjoyment.net/93340396103.pdf
    • https://cdn.sqhk.co/suzeboxiwo/GLgcjb9/84458094324.pdf
    • https://cdn.sqhk.co/ragebobeb/Vjijiji/sad_ringtone_2019_tik_tok.pdf
    • https://cdn.sqhk.co/rukeditele/3SJWjiK/tonight_s_nfl_games_on_tv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kanisal.epizy.com/best_beginners_guide_to_stock_market.pdf
    • http://runozozupegefo.epizy.com/50189240741.pdf
    • http://fufudaloxola.onlinewebshop.net/the_girl_with_the_dragon_tattoo_2009_full_movie_english.pdf
    • http://vitupofelomar.epizy.com/adb_fastboot_drivers_manual.pdf
    • http://laxolivavaru.epizy.com/titomowebabeparodovo.pdf
    • http://tunarijog.rf.gd/nojagikidudozefatufutexa.pdf
    • http://lowadof.epizy.com/google_sheets_count_if_sum.pdf
    • http://gegokuberil.rf.gd/taxes.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_off0000dec7.bin
a94a091d01ead59462fe7d3ffb792954747964e3f5968f56a96e9fab18d8d903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 5720 bytes
font_01_sfnt_off0000f256.bin
b68ce8b5c043502a6140dae6f88ecf3509298af63db79fc8e07902401304717b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 9992 bytes

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