Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1749db470eaa56…

MALICIOUS

PDF

40.4 KB Created: 2020-11-06 18:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 094707328f7a090f2fe073a3b35304fb SHA-1: 261800f432ce934a5f28b67400083bd79268cb98 SHA-256: 9e1749db470eaa562bfe8c7c7a88aebbe8935d73ddc5f40657fede55b5745c11
96 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/aws?keyword=3rd+gen+firebird+dash PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8c042cc12e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5f9ee3a6da390.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/6550508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5f8ef88558203.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/2145a946-8d34-4072-ae05-9e22225edcaa/reflection_a_twisted_tale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89fe3b1-30dc-49be-8e55-7781341683ff/bepasevinijabalafefemidax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b7c020-5778-452e-82a6-6d77804b8ed6/1122746562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8753e191-21d7-43ef-841c-f3be471dd46b/munekuxorogoredefoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3f3c72-bd58-4337-a30e-671113f8fd33/figazefebujulerolise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19c5482-a77f-439d-bf57-277070d82b05/order_and_chaos_tailoring_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aeac60c-c67d-4424-8796-0b9d9adc87ce/35135822229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6f95fd-528d-47e7-a664-531702d12fa8/15673775465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4e7fb3-a5e1-4540-b13c-11c44a9cad40/98343993846.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_off00005b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B27 5348 bytes
SHA-256: 6bbdcba66cf61e7d01241de5f8f8b90f12f833cb66fa92dbf31e633c24981322
font_01_sfnt_off00006d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4E 11764 bytes
SHA-256: 6e7276c3c918211efe2ba556660f4b8888d2c808534cd217a4a9f89d02017e75

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