Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c4ec292274fe93…

MALICIOUS

PDF

79.6 KB Created: 2020-11-20 13:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bdeaa5a15087ae03c29aa8db959682ea SHA-1: 118941534ca6804f58ad7713842f9d57d338c6ca SHA-256: 24c4ec292274fe938ed1dfcb27de59e2ab4b2aae4eca9246e5fa13a536c33e38
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://trafftec.ru/123?utm_term=general+deterrence+theory+pdf PDF link annotation
    • https://rinajota.weebly.com/uploads/1/3/4/7/134714435/1564684592d76.pdfIn PDF document text
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/d282e8e76.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/8b2e5e74.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/dujejufijado-guxagem-xutera-pagoramet.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/a243b330-34b2-4938-a5f7-670d23afd384/19678781901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29da5db2-4bd5-4455-a20a-53c4ec392da3/jixekidelifasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48877e9-21bf-44f3-bb4c-276386f63572/74687284581.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/88786307390.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/how_to_apply_a_vinyl_decal.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/zatiwobodonutet.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/bcom_syllabus_bangalore_university_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/fededaronimokabixilivoz.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/3224157789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7df04f-874a-4cd5-87d3-030a622a36f9/grapes_of_wrath_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/fundamentals_of_engineering_chemistry.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_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 5196 bytes
SHA-256: 4f5ff5821427df20e2161cc7590366789a94c93674bc15a353bd93ca011c0d1f
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 11412 bytes
SHA-256: edeb14a1c0dcb136d9a364bb238acf29ae2501d2a8b3dbd0ae76e4548bdfd501

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