Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ff2b64c64ac720…

MALICIOUS

PDF

72.6 KB Created: 2020-12-28 17:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dbe899947e7a74c673d0783608a56313 SHA-1: 6f65523e7aeeadaacee641001918cd4f1b0b4630 SHA-256: 38ff2b64c64ac72053ede8deef077a4cd2200b3d07b0693761029d2f96c54d91
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, indicating a link farm or redirection mechanism. The primary purpose appears to be directing users to malicious external sites, as evidenced by the numerous URLs extracted from the document.

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 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://trafffe.ru/strik?utm_term=tumblr+wallpaper+pink+pastel+aesthetic PDF link annotation
    • https://cdn.sqhk.co/perigupa/H01yojc/zoxuranalonamewitopaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/idGjkje/messenger_app_download_for_pc.pdfIn PDF document text
    • https://vemudafu.weebly.com/uploads/1/3/4/6/134655664/fumunofudibasigusape.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/5jcAkAF/62632851395.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/d8wschc/easy_cake_recipe_using_gluten_free_flour.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/0hggha6/republique_dominicaine_covid-_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5fba053da6e52.pdfIn PDF document text
    • https://cdn.sqhk.co/kivuwutu/qrjhjcK/41222420560.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/1Xhe0gc/tagejinesipowedutenadiwer.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/izyibJy/mind_games_offline_games_for_pc.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/c79d2093-c34c-4781-a5b4-59ae376e1dd7/12993821679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14af62eb-c2ae-431a-a772-6fbe87dd5529/jipemedizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266b5f62-00d8-474d-87bf-c04dc4abbef3/xebegorijireziwulomoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd2bf3a-f626-4fe3-be8b-426d09bf24ab/internet_download_manager_fake_serial_number_fix_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 5416 bytes
SHA-256: 3f2857412187f124b2bf8635e7e0dbb91af7659e8312bf26949ad95651de2868
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10356 bytes
SHA-256: 2de384ce61a654998a5d3dd3b0595378d10167c41d625c4aedddbfb5e735b777
font_02_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 16736 bytes
SHA-256: 1218d20fcd21c8f015f50981bde259647bb5491f21634084b15358b6fc7d013d

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