Malicious PDF — malware analysis report

Static analysis result for SHA-256 968278a10820ebc1…

MALICIOUS

PDF

45.6 KB Created: 2020-11-07 21:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf70f802b139cbef4d621159dc8c2b67 SHA-1: dba671f4d81afdc82bf0817e44b54c20fa7712c5 SHA-256: 968278a10820ebc11410f960ea31ffef1318a689f3b885b4b06890cbdf1d4033
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://trafftec.ru/123?keyword=interactive+science+book+7th+grade+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8ed6c418927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5f8c45fda6648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5f9a8353a5269.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/9eefc1a.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/4457859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f91e6fd42f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f9de25660680.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/tomugewovafol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fa03fd0a0d2d.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/99e78fa34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f9c9ff721f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5fa50c8c001b6.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/jaburirarov/paradise_lost_summary_plain_english.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_off00006ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 5664 bytes
SHA-256: c63351094f374e6b5a131c215b3e56c99649dfc3649e1fa15ea077c11c200fd2
font_01_sfnt_off0000833c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x833C 12380 bytes
SHA-256: 37f1e9a21ad3f2ac16a692a137cc7964c6cd6760f488c0e3a90ef6bf56e423e2

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