Malicious PDF — malware analysis report

Static analysis result for SHA-256 190d1024745eb55f…

MALICIOUS

PDF

75.6 KB Created: 2021-05-08 12:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4cbcde755215960f3f7da7c2d39d5c6 SHA-1: a090dafef5f9c9f188042f9a975419208b482a6e SHA-256: 190d1024745eb55f39cf6a2c08f7b04e16e53b72acc825ac61009a4ff3e64cba
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to drawing tutorials, but its primary function appears to be a link farm, with numerous external links to other PDF files. The presence of a malicious ML classification and ClamAV detection, along with the suspicious URL 'midufefew.ru', indicates a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests it's designed to lead users to malicious content.

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 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.
  • 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/strik?utm_term=how+to+draw+eyes+for+beginners+free PDF link annotation
    • http://verifybadgesbusiness.com/gaginaporodubufunukipi39a7q.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/classical_economics_vs_keynesian.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/lozaxowezatubajonodel.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/definite_articles_in_spanish_worksheet.pdfIn PDF document text
    • http://peludofnor.fun/1993_mazda_protege_repair_manualgu3qx.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/swot_analysis_sample.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/13bfcf935f11d8.pdfIn PDF document text
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/dc1d3.pdfIn PDF document text
    • http://thehensleys.org/77911133716191f7.pdfIn PDF document text
    • http://erkutungotu.com/9577371350of6vu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/48712303956.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/sezevopedufatusevu.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/fumazeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87e88c0-04ac-47b4-950d-52cc94b19216/61450402751.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/ags_united_states_history_textbook_answers.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/gukilasugekekejolopid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9805ad8-bb77-4678-9e7f-281fc9995f93/funny_male_saint_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae22d077-aa53-45fc-bc0d-424478ec6acb/kezufuzovakigokusal.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/ruxubijixov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05efcdf-82a4-46ac-96a8-8227c0310ee2/safanajetotubar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3711b7bc-3c2d-4fdf-8afc-3506d44005d4/romeo_and_juliet_famous_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d12f3d-f1a2-4f39-8604-fb77f0cb0a45/how_much_does_nike_air_force_1_cost_in_south_africa.pdfIn 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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 5336 bytes
SHA-256: 0032fa5e7cd84ba64599630b68b48d918946cc0ba20b54182735c1a9e7c74e6e
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10988 bytes
SHA-256: 469db36b1dea1e8bfbe8a3320d6b325099b966248822483a6113d8394008740e

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