Malicious PDF — malware analysis report

Static analysis result for SHA-256 081f7bef4d4d5a13…

MALICIOUS

PDF

48.7 KB Created: 2020-11-08 20:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c4a95a1d920dcd46b9b5223ddd54fce3 SHA-1: 926b5b5c8ff5fd9dee5fd17924831e2f2b92a3c7 SHA-256: 081f7bef4d4d5a13ac091e1ac5f1bbe582fec86f018022c6f8a1acd4fc94464f
96 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/123?keyword=guiding+principles+na+pdf+free+download PDF link annotation
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/bde6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f8e4ac9d57f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8746195c4c6.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/727371.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/kukazowox/the_lion_king_2019_online_free_123_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9540811a-ad4b-4951-a618-582354205a92/dark_web_links.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7bb26be-25d6-46d5-ab9c-b75fe90722ee/62512425122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c7359b-4082-4049-ab97-ab756546f288/xabivepavotedokilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbd7540-86f7-4f14-aeaf-7a797e60f9fc/11533130877.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/black_ash_tree_leaf.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/vivonesapeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3937d0-24bd-43c2-ab17-38eee48c509d/78115572202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d647a5f8-6cff-4082-80c6-beb46f7e7252/50115510016.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_off00007eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB8 5448 bytes
SHA-256: 392041c430a29a0db2f264827a0a2cbd5c4ed01055ec6da100a379d53ac6ec49
font_01_sfnt_off00009167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9167 10664 bytes
SHA-256: e38273f36656ab85f3a23d87ecf3c9c13441a57ad12e8ed062c650e56a78a85a