Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbefa7c36548e0…

MALICIOUS

PDF

66.5 KB Created: 2020-11-19 10:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 99844fdb22e3832eb7a50447f1a35777 SHA-1: 10e10f3b3cebcb0c91a4f36320b3256cb9e6e32a SHA-256: b9dbefa7c36548e02e1a536004986042fc408e61b88e7042f2a5049d2295359f
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 0.9980

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/aws?utm_term=glider+paper+airplane+guide PDF link annotation
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/vutejosafifekujawek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f89eb190fd7a.pdfIn PDF document text
    • https://jonelezada.weebly.com/uploads/1/3/4/6/134603833/05a601d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5fa8c1c7a3c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f90aaf29227c.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/6c306d2.pdfIn PDF document text
    • https://palalolak.weebly.com/uploads/1/3/4/4/134443088/5676644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_5fa71ab78cf75.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/nilafafakem/37435129020.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_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 4980 bytes
SHA-256: 90c544ddfc20b71504f9d4b8de4d772849d2b66c8908e839b1737e35f07ccca8
font_01_sfnt_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 10320 bytes
SHA-256: 3c88d6f950ed85c9eb06e00e9bdc32011ae60743bc60a73c4a639f6fcec8edd6

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