Malicious PDF — malware analysis report

Static analysis result for SHA-256 12500b322983e91d…

MALICIOUS

PDF

35.0 KB Created: 2020-11-07 07:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5cdcad30822863f2818dbc25ad5de567 SHA-1: 31f18fe6760514c249eb75c2a32c5896c58547eb SHA-256: 12500b322983e91d57ef46e35d54b45d1efa2e25222b779b40323259f7c04c02
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URLs is 'https://traffnew.ru/aws?keyword=sonora+middle+school+springdale', which is suspicious due to its dynamic nature and keyword stuffing. The document body, though heavily obfuscated, also contains this URL. The presence of numerous links suggests an attempt to manipulate search engine rankings or distribute malicious content through a network of linked PDFs.

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://traffnew.ru/aws?keyword=sonora+middle+school+springdale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5f9546225ae95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5f9578b349b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5f9fa58b402f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fec4e14-65d8-419d-b59d-cac1d74db109/75669696113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1361f3b1-3a4e-4ba3-ae1f-0f453b518a53/23331541737.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/modern_furniture_design_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02378376-4f36-44d6-8114-8dbcbb665b6a/72016412683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c107fcd9-ebb1-48aa-9fb2-372c7dd76b54/25172988573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f344dafa-0f55-4b23-ac38-743257259522/mebatolusolom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c96dee6-1588-4780-bf23-6ffd08340054/serimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa4872d-7843-463c-b0e5-248c593d08a5/facts_about_ares_the_god_of_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3171ac3f-4495-4824-8786-90817947e2ae/sarekadinilugugoziwajogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565bc9a1-3848-4a5b-b62f-4ebc465f5d99/gcse_science_biology_diffusion_osmosis_and_active_transport_worksheet_answer_key.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_off00004881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4881 5592 bytes
SHA-256: 461358661202d482c2cc611e15a7aa207a92598106208b6374c6ddf498e060c4
font_01_sfnt_off00005b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B56 10580 bytes
SHA-256: 29b5709df1473c689c3799c15fccd08f23dc30f9ff20d3be4f9ea708754a385d

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