Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae936f41809850fd…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 14:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f635d9882c76c887ee3df5a83633ea7e SHA-1: 16d8fddfd57f35c0a92d990f161ae05384235387 SHA-256: ae936f41809850fdc924c15e1056e69a59543db786a8be964f6cc9b987c9564b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute SEO-optimized PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=modify+pdfs+for+free
    • http://dinabosovub.iblogger.org/fowilojediwiziwik.pdf
    • https://cdn.sqhk.co/woxemumi/kCycxge/35292838680.pdf
    • https://cdn.sqhk.co/lojibuwe/JqCeQgj/company_of_heroes_2_review_2019.pdf
    • http://xifuponek.iblogger.org/how_to_start_a_comparative_analysis_essay.pdf
    • https://cdn.sqhk.co/zigimovovu/4ifCBni/grow_idle_archer_mod_apk_unlimited_money.pdf
    • http://kofugefosuziwib.22web.org/30191398461.pdf
    • https://cdn.sqhk.co/runusamopit/eghiijg/lymphocytic_colitis_diet.pdf
    • https://cdn.sqhk.co/jivazufevi/hbhdjhx/75720390696.pdf
    • https://cdn.sqhk.co/vutexexukus/aWiahYU/61649590913.pdf
    • https://cdn.sqhk.co/ragojagef/jh6NCih/wivorotenofojamuvutekoke.pdf
    • http://dedekuwetom.iblogger.org/how_to_describe_climate_weathering.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e49c977e-aa10-40bb-8c23-0a5e3c2d5c62.filesusr.com/ugd/3b0c81_67b6742419fa4b92aa5a27eb1e583a04.pdf?index=true
    • http://ziwejozaz.epizy.com/rezatim.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_7f63568d2eee4b0faa4de259a2968365.pdf?index=true
    • https://s3.amazonaws.com/fosagoba/babul_full_hd_video.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_ff07379a92a8468fafbf34987a1202ee.pdf?index=true
    • https://s3.amazonaws.com/buxoparadazegu/25121728359.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/b._ed_form_fill_up_2019_odisha.pdf
    • http://zujabazu.epizy.com/what_is_eva_gutowski_net_worth.pdf
    • http://zipokuxabatu.rf.gd/51316996347.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_abcf3ca56ba44dedab72c6a9f3bc48bb.pdf?index=true
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_41932f2ae0a641e1b4047f7c016e5946.pdf?index=true
    • 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_off0000ee84.bin
30dfac412f3dead09d9597724e6cc483e853d3cda1edead5a1f8197bc8332347		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 4900 bytes
font_01_sfnt_off0000ff5b.bin
dd789941f2634aaf7956a60b3e1d336193c6613e0487507d74c11cdf80e27b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 11068 bytes

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