Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1587d8fd2fe8f0…

MALICIOUS

PDF

69.5 KB Created: 2020-11-22 11:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cb0bc0c8da25948e22e658276744c3f8 SHA-1: 494ecd25a15e06b129582996877e9410bdfe8bc0 SHA-256: dc1587d8fd2fe8f08ba6d7df955126919d3ad88c273afebc18d3eddd64c8e861
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 by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://traffset.ru/123?utm_term=cooper+discoverer+htp', is flagged as suspicious. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to potentially malicious sites, possibly for SEO spam or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=cooper+discoverer+htp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fa6dc2280f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fad9386c0ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393022/normal_5f9339b665815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_5fad3670b30a8.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/pemawopo-ropiwofe-riburel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f8a6aab196da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_5fabe6ad8f9f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/pentax_6x7_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/57668292441.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/57105114032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e68e53b-37fe-49d5-bb8e-8217ee154f4c/goedkoop_bestelbus_kopen.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/16312145295.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/nizezogedis.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/3858688140.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/6672166028.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_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 4884 bytes
SHA-256: 9466f9a429ae1a9824821b1f04fda4ada370e91dbdad40b6b27a1d861eeda070
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10560 bytes
SHA-256: 27d37b96aad77978acc953ce8dd3a43da5b59395d6ad5883c95bb48e70207046

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