Malicious PDF — malware analysis report

Static analysis result for SHA-256 1884626f5576a2a1…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 19:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 57ab364c14dd8788aab6b3f883b8b9fe SHA-1: 2339133974b1ab9f321c9eb3bdfea7e624aba7e4 SHA-256: 1884626f5576a2a13b5c6e62a034a09079797ee8ee070dc4e89e755b02e9f131
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://jacksth.ru/wix?keyword=david+irving+contract', and another heuristic highlights a large number of PDF links, including 'http://mobeditobaxul.scienceontheweb.net/tugezaduwuv.pdf'. The document body, though heavily obfuscated, contains keywords like 'David irving contract' and 'wkhtmltopdf', suggesting a lure to a link farm. No scripts were extracted, but the overall structure and link farm heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=david+irving+contract PDF link annotation
    • http://mobeditobaxul.scienceontheweb.net/tugezaduwuv.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/poxawatudagaxiv.pdfIn PDF document text
    • http://luxuwum.mypressonline.com/97093105728.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/xunezobotevi.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/dd_5e_players_handbook_with_bookmarks.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/nadoxodekutu.pdfIn PDF document text
    • http://lapivakop.getenjoyment.net/seismic_stratigraphy.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/wibadinavosunom/61728343270.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/cuanto_es_8_centimetros_en_milimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/xosemomoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e057c5db-b50d-401e-87b3-a03af1a59319/estructura_del_texto_cientfico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e05a5d-5315-4f3a-a2e1-ddf5cd6e460a/6677724464.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/80231258618.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/87861106872.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/harley_davidson_iron_883_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11334db7-30e7-48bb-bf83-10f61f006158/48620471432.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/xerostomia_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/saree_blouse_designs_images.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/veduwefugabajeseropefiwul.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/cisco_webex_add_on_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d977ef58-f54a-4155-bc8d-5754a46ee6f8/dowel.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/forming_adjectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/fabric_softener_sheets_keep_mice_away.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db2721b-e3e7-4ef7-a1a0-e9773e56bdcc/poxedifefaxoxowemogifafok.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_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 4956 bytes
SHA-256: 4c9b00e0ea3d03e6f0845e4ac5956ba5885284cf4edf07b031036e76ecb37fb7
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 11016 bytes
SHA-256: 804af043c2777fdb4053e7b5ec2c1450ec95aa0ad6874418117901b38e2a4977

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