Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee06b736e6d59c0…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 04:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3b75487f41b246776e4ef7fd13cf48f6 SHA-1: 580f05fe91cfe0bf58922fc7c75c97d5337a98bb SHA-256: fee06b736e6d59c0ce109800804be4d936307f87c37ce56784ded948642f353d
134 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=diablo+2+bots+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392195/normal_6007e2aeee1d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_6017f6c711250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5fd1bdb12197a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fea2584ab84d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_606c1b5858125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_6024f43d7401d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_60355500882b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_6065279b1ddbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502721/normal_5fe8b2dc0919b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_60677ec039ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_60698ce6ac55a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6052bfb11e176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_60254dd9a391c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_1678153dfb554b28b0312825db3c1818.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_98b446c5a876472d9920f11e88cd905a.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_67e42e8e2155418b829183aa9161060e.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_61b0109e1d344dc9b790d5cadf2d1f56.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_485a8b93122e405283a362380a50efd0.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_cee0b1b42a3f4d0b9be8640682cf1edc.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_7ef25c6f32d9411dba66e8cd6fa42b15.pdf?index=trueIn 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_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 5088 bytes
SHA-256: c3c435b2815fa1fb5c0b3d8a482db21028ac68a78d618d12ce1283eae3e670af
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 11956 bytes
SHA-256: 2e02320a260bfecc3d98be4e449140f03710f00653276dbb34475381a19f41b0