Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb16fa92f6fea4f…

MALICIOUS

PDF

73.5 KB Created: 2020-12-15 07:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 06683d51a7ce1007eee45d5dcf90b7c7 SHA-1: 337d4b0cb95fc5809ec97fa0078abbab6bbc454b SHA-256: 4cb16fa92f6fea4ffad445aa881afc8b858cbb86b18ab69be063845ece81b125
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=oushitsu+kyoushi+haine+wiki'. This indicates the document's primary purpose is to lure users to a potentially harmful site. The ML classifier and ClamAV detection further confirm its malicious nature. No scripts were extracted, but the embedded URL is a high-priority indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=oushitsu+kyoushi+haine+wiki In 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/cea6a537-a61b-4e07-ab20-78fedbcfc34d/freedom_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a4fe02-0744-4c63-a16d-785016719826/33184382539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c8ed5b-7d8e-4c2a-a602-7fcf379a00ac/44116578714.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14bb05687f52b6b83d941/t/5fc896cf4b97230d0510d08d/1606981327318/nba_2k20_switch_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9c49b0-1941-484a-83d8-6bef63ca34ce/words_that_start_with_the_suffix_pre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2f5315-8bff-48a8-9022-b974e2bc2328/texotuvawafanesivivara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b2dc4b-d0db-4ce7-97cc-8a8fc0949128/10665341137.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc1134008845d0924b067ba/1606488897946/16631790456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3500ba-251d-459e-a475-b1a180a8d423/salidigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878c4659-de2f-4d8a-9c16-7152ae30f3df/bmat_2013_section_2_answers_explaine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f0b3cd-0d84-4591-99d2-8f2ec6187257/google_hotmail_com_sign_in.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/vsauce_michael_here_where_are_your_fingers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 2972 bytes
SHA-256: 0bf9469f6cbf64c0badb18945d2c2eb4c7a4e472e7aacda42aec409c4e2fe86d
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 4932 bytes
SHA-256: 31705765ca9d0fc55a8b4bb1187cb1cd1a63c9f4a6e4b2f6dac2f7ed5d8a7a74
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 12536 bytes
SHA-256: c9b7686d528893d8f0719754a86f9c669fb8916d708647402b933f1aa460479d

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