Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ac21acd5ba5665…

MALICIOUS

PDF

67.2 KB Created: 2020-12-25 23:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d6a265efed5ad552574fcdd3c9995e2a SHA-1: db781a80d97b5957a654020d33054d2763b7b677 SHA-256: 96ac21acd5ba5665f53dd1974b3551e5918afb76c11998925c83a3b003fbefe9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by multiple heuristics, including a critical finding that it links to known malicious redirector infrastructure and a high-confidence ML classification. The PDF contains a mass external link farm, with many URLs pointing to potentially malicious or redirector domains. The presence of these links strongly suggests a phishing or scam campaign designed to direct users to harmful websites.

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
  • 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.
  • 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.
  • 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/strik?utm_term=the+communist+manifesto+book+for+sale In PDF document text
    • https://cdn.sqhk.co/gaxumisi/h7qjhaC/80870925436.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/gafuruvux.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/025ce3a3-30f4-42b5-a417-357c8cdcfa8b/record_of_agarest_war_2_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cefb056-9acf-4316-ac98-6fd7b2b27694/estados_de_la_materia_y_sus_propiedades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bbddc7-9063-4ee4-8d1b-cd2dbb7c1257/zetatokuzogorog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbe2d07-dfbd-4313-87b7-fa6d79ebd1e7/dell_optiplex_gx280_ram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a7ef6d-ca1d-4ab3-b2da-6778c36a7d5c/my_virtual_girlfriend_julie_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81779f04-3a8e-42f6-85e7-6f74abeb73da/the_psychic_pathway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062832fc-6331-46ff-aa34-c3985f8a1381/59031596285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d06a46-5691-40aa-aedd-2ab87e356bc6/94456331775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6261a3-52ee-43fb-a553-ebaa0e82acff/teacher_application_lesson_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29aac97f-e0fc-48a1-99d4-4badaafb2d0a/kowedemufazan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edda9b8c-b795-4133-ae6e-ff81eaec58ab/iphone_external_storage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d494e1fb-e9ab-4645-a177-7f64a428e66f/keziba.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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 5276 bytes
SHA-256: 11cfba706c961a6b2f086465580f80405b2cfb6600180c09a70601a4545137bc
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 10788 bytes
SHA-256: 790eea387a184cac126f22a0c5a0e882f475c00577cf1d3fe09cff64f8f43c78

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