Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd06587ba7122da…

MALICIOUS

PDF

74.5 KB Created: 2021-04-14 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d762cc13f54ab9dab31234677a977dd3 SHA-1: 4e70b40b09eead8fe18260061a4e09f4e3215a8e SHA-256: 5dd06587ba7122daa2ced301f1a71695374702a8752d2bdc56155145a5f46814
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=2000+kawasaki+prairie+400+battery
    • http://znasila.ru/doom_patrol_trailer_season_15u0x8.pdf
    • http://copriyghtconfirmed.com/marriage_wishes_images_freex92yg.pdf
    • http://wibusutozojoz.iblogger.org/analysis_and_design_of_linear_circuits.pdf
    • http://pollsexpert.com/61005978506vzj6i.pdf
    • http://springwin.space/camera_360_derajat_androidh1tof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6da7fa6f-061a-4545-9d13-4fd18f7ae394/22597757771.pdf
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_5e64ff017c9545f6bd553e9652600967.pdf?index=true
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_fa5462bbee35470c9a74c228759fcb4a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ae6c977-f286-4926-98cf-81c36d0309fc/pride_and_prejudice_full_movie_1995_episode_2.pdf
    • http://renebizokav.epizy.com/43179484520.pdf
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_d043624907ee4bd88b395405d713b3ec.pdf?index=true
    • http://nasalimutele.rf.gd/27428356488.pdf
    • http://nenizumudi.rf.gd/diablo_3_best_beginner_class_2020.pdf
    • https://uploads.strikinglycdn.com/files/549314c9-1778-46ca-8269-b5d29964eae6/38442304814.pdf
    • https://uploads.strikinglycdn.com/files/093b97f3-3d39-4ca5-890e-43681107f1d2/81168700513.pdf
    • http://lozopavo.rf.gd/jozurugaked.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_f35c749fc3564807932d617c3e533f80.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_ca9dc87fa4f74acaab32186e1c0286fa.pdf?index=true
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_f90a7b20ef054ddd82bc4fa6c26602ba.pdf?index=true
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_69af0384d35d460e9f8b73e2578a1d5f.pdf?index=true
    • http://todonoto.epizy.com/2338732392.pdf
    • http://lolowavedipugis.rf.gd/heart_of_darkness_marlow_quotes_about_kurtz.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_cc847a545e474d589a06b9fa5ad2b8e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ae165ca-7f92-446c-988f-cf29c426fdac/42354904828.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_off0000e46c.bin
833b7989b7076495e4d89ae5acad6b9db9b503048ea6e7e9f591261a05b754ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 5448 bytes
font_01_sfnt_off0000f723.bin
ebb03580f5e28991090dbc10e0e0c9af62cc0612b32f87fd81bbcd0ac44059f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10972 bytes

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