Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae18078ae682fbc9…

MALICIOUS

PDF

76.3 KB Created: 2020-12-03 01:31:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 429fc184cab909eee8f97541e6c637bf SHA-1: 1244ec70fe319e3379aec60ca2bda54abe6fe66c SHA-256: ae18078ae682fbc9800ebe70023e6676ef8dcaa5d99f4a630cad76ad639552e5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=army+nurse+accession+bonus In PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/tekibir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8e663328197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5fb32747b66c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_5fbc140d98054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5fad508d220f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fotepopunaj/elite_fitness_inversion_table_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/2135709418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539d206a-4309-4ca9-ac4d-b7889dd5d278/letters_of_retirement_from_teaching.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f08c104edf1d7780fb42/t/5fc5a487145a8629dc73dfab/1606788236066/u_wrench_it_st_louis.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/44397355731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c0a86d-77ca-4f0d-95dd-1d81c21ab08f/39397767804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512bd909-2707-4f01-9d0e-94b6a2f30c19/44525502871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61501fa1-984c-43b1-b17f-42ffbb0b4546/335517896.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 4944 bytes
SHA-256: e5f8cdbd0b4a690b0eb704064e0eaf544ef8db7b7646b89c1bdc4aca173863e4
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 11132 bytes
SHA-256: d710ae1bd2b09647a7c960838d8ee468aa50548f2e48f317cf716939b6041f50
font_02_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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