Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7aa68cadd01bf6…

MALICIOUS

PDF

39.8 KB Created: 2020-11-06 14:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2dd501267cdf34858249e880383416dc SHA-1: df60d65fe07a41ee9e335a8c9329864eff464436 SHA-256: fb7aa68cadd01bf670be15e770deb2f6866b5c249bcd063f9cc7378c4de236e0
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 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=order+of+resume+jobs PDF link annotation
    • https://welofubevi.weebly.com/uploads/1/3/1/8/131856084/tirezisuzafilix_zebifefor_tasiti_guxotevegomulu.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/petirozafoxizukifex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_5f9f5799a6268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5fa512e874dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5fa0e17cccdb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f95925037f1e.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/tulosa/vmath_third_edition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/hope_is_the_thing_with_feathers_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717f5662-72fe-4e91-ad6d-f2a17686df42/dragon_class_sailboat_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3094a27-d174-4dba-9c18-e3b4efcab717/kigofifemosogaga.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/administrative_information_systems_ais.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/mythbusters_penny_drop_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/71876410862.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_off00005fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 5052 bytes
SHA-256: 5d05ed08da42162d963f680ee37ce0f521536c07ed2e00b3ae36512d0b559433
font_01_sfnt_off000070d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D9 10020 bytes
SHA-256: 5e3676e7c69bf099b550fc566d64a373f11863e32f054db614ea9de156ece8e6

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