Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebb5a7ff8aee8ba…

MALICIOUS

PDF

71.5 KB Created: 2021-03-09 10:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c47d57d3db7b74076ea8ab59a5bacbc1 SHA-1: cd0106b19e638c9729924617ba61c80091d5511d SHA-256: 9ebb5a7ff8aee8ba990d0bdd6ca6fa747858a0103e8cf80194c9c8b91070c17b
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one pointing to a suspicious domain ('kuzutuzo.ru') that is likely used to host a phishing or malware payload. The PDF's structure and the presence of many links suggest it functions as a link farm designed to redirect users to malicious content.

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
  • 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://kuzutuzo.ru/strik?utm_term=1990+wheel+horse+520h+oil+filter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459774/normal_5fcb07b940a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_60172d0d53aa7.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/lepufozoxesera.pdfIn PDF document text
    • http://fajamad.mypressonline.com/does_neopost_postage_expire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35fb06f-0737-41b1-8e51-882a185ee6e7/53468750862.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/vimenokafaruvi.pdfIn PDF document text
    • http://guxajez.rf.gd/report_fire_hydrant_leak_nyc.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/aradia_gospel_of_the_witches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d653630-02d9-4298-ba18-83fc57ac1cf4/wikokibidafuvavibokojedek.pdfIn PDF document text
    • http://posinumufupe.epizy.com/love_after_marriage_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1462d106-fd6e-49d6-8a11-92a9ba635b5b/how_do_i_reset_a_kidde_carbon_monoxide_alarm.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_b5b0b2c3737947d2af175a025fbd85d4.pdf?index=trueIn PDF document text
    • http://zupitatip.atwebpages.com/jetukifejawok.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/sojuzewifox.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_665de64af5974a2299b085ce8c4c239f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/15721879573.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_2c98809742004fd680be99e76f13b586.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_bf3b845b1a3345ddb4d2c170920bfd15.pdf?index=trueIn 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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 5248 bytes
SHA-256: 935ebd415f4d37527c6c8d07e4d853b8c8663e9f78bfbdf72fc7be872d50a61b
font_01_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 10492 bytes
SHA-256: aa2e65304fde628a4972e1c9191dabb077f93a20b751723b9c7c0ab9ca9d7a2b

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