Malicious PDF — malware analysis report

Static analysis result for SHA-256 95307a4c7420d56e…

MALICIOUS

PDF

62.4 KB Created: 2020-12-27 21:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3b51d1c0c187dd57376b6b4c69a81a0b SHA-1: c721465b7ec1701ac63b2c1488a037330d5080da SHA-256: 95307a4c7420d56e755de46ddcd218f0587de1b5194a8c63fc065f9fbe4541ab
74 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, hosting numerous links to other PDF documents, likely as a method to distribute malicious content or for SEO manipulation. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent. Although no scripts were directly extracted, the overall structure and heuristic firings suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://trafffe.ru/123?utm_term=fe+civil+engineering+review+manual+pdf PDF link annotation
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/b3285aa.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/TMphcie/migebozekiwar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5fe2afc8ab2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f8aa148524eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fe05d7dae786.pdfIn PDF document text
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/7243a235839.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/niraso_fawativurobit.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/retawujigerem.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/OGibjcx/wifasukagawotu.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/68e187d0-449e-4efc-9c71-6729143a18cc/g10_vs_canvas_micarta.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 5404 bytes
SHA-256: d7b77f01794bea34f82b7d03e2a963fc2085d4f8d2e21d92da6335e20753f67f
font_01_sfnt_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 10232 bytes
SHA-256: d3083972dd22b42e4f935b5a2db711962a822c46ebf8216ec2b399f1ce401deb

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