Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacac18d565ead4c…

MALICIOUS

PDF

72.3 KB Created: 2021-02-20 19:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0c38f9a8df0f43434abf7e0ae1cd0817 SHA-1: 8a644fe60299b567e55fa3969a820dbbefadf097 SHA-256: cacac18d565ead4cc46978bb01d6ad18df32558093dfe81c362ae309d43eaaab
184 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, with critical heuristics indicating it links to known malicious redirector infrastructure. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous embedded URLs, many hosted on disposable domains or link farms, strongly suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+way+of+the+world+summary+act+wise In PDF document text
    • https://cdn.sqhk.co/nolovojawek/1jfjdHj/mokemikirobusos.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/1048220.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/a5f72417ee9c.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/ijbsmih/hide_and_seek_dorothy_mod_apk.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/053dda91.pdfIn PDF document text
    • https://cdn.sqhk.co/daribugubive/fiiPdid/jozeferafuxowusa.pdfIn PDF document text
    • http://qiwi-wallet.online/south_african_house_music_video_20185dsw7.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/Mhfghhj/island_in_the_sun_by_weezer_lyrics.pdfIn PDF document text
    • http://matteset-spon.space/labuxusumebegexaweas8r7.pdfIn PDF document text
    • http://igafnd.org/pixopewalexeporedanatefenu0uf0.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/ggjf2ds/55089306161.pdfIn PDF document text
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/9d38e28d406.pdfIn PDF document text
    • http://yblda.fun/indeed_intermediate_spreadsheet_proficiency_with_microsoft_excellfeb8.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/ZXicxFV/pinball_game_download_for_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Piej73r/women_s_callaway_golf_clubs_used.pdfIn PDF document text
    • http://coins24h.com/dune_buggy_las_vegas_grouponm14t8.pdfIn PDF document text
    • http://kodamup.22web.org/candy_camera_latest_mod_apk.pdfIn PDF document text
    • http://goldenframecollision.com/xezevirajoboxokbeze8.pdfIn PDF document text
    • http://rocketdocs.us/twilight_2013_full_movie_download_in_hindi_filmyzillajwuiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 5404 bytes
SHA-256: ca10a0fa692a325d1041dcffb3765986763dc2db41a644c8d29ecf56fa28659c
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 9768 bytes
SHA-256: d4636dff6164450caf683c5e632c3437cb52606d58915b7f61b5cd458d840846

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