Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a44e3d58c8dfd36…

MALICIOUS

PDF

41.2 KB Created: 2020-11-08 02:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e5fc386d24de62bb9a0ecd5b101caccd SHA-1: 1883793f78483f7ae0f9290bba79de8cfaa9a82a SHA-256: 3a44e3d58c8dfd36e4ed0b79619f313a9909441445cc7c13e0d402fb5ee1103e
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. While no scripts were directly extracted, the presence of embedded URIs and the ML classifier's high confidence suggest malicious intent, likely to drive traffic to potentially harmful content.

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://trafffi.ru/aws?keyword=st+joseph+shrine+michigan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5fa4a638df75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_5f9e78c674d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f922bca6ad5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8803d444d99.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/9542d8d2-ba93-4038-93f1-cc5b50e8d1a0/18130747290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3c2874-ae41-4248-8739-14f19422e167/blue_pelican_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1dd9a47-8fbb-4291-a98c-30f1a3832008/46166112503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdcb902-d3c3-464e-a207-d8c784b33b44/watch_the_pacific_series_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1da19a8-aacd-4fdc-8b75-89d1656742ae/film_bedevilled_2010_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28724c04-6dee-43a2-b942-112313c2c99e/31591781524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e090fcec-b5c8-45c7-aa15-81b37b18c6dd/dibil.pdfIn PDF document text
    • https://memixetuti.files.wordpress.com/2020/11/terofujoduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f042ed17-a2e5-448f-a1f7-20a803739182/20949458450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc29b982-0bc4-48b8-8ef3-723327b8d6a2/mowapuporubuneber.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_off00006248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 5492 bytes
SHA-256: e9b01c97f008f60131c94cc62a1b718819eabac7ab16f0b7871d58c0141aca7e
font_01_sfnt_off000074d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D1 10220 bytes
SHA-256: e446ade045082443c92db9e65501d3ba57573252a54b2e67d2f2471a8fd3bd67

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