Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6650900418fa995…

MALICIOUS

PDF

52.4 KB Created: 2020-11-06 19:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 84d4a5f262b97a6d9c3809cbbd2a5670 SHA-1: 98c3b3d43010cd3c91dfb6892dab965d796254fb SHA-256: a6650900418fa995408b6f2f9c4a1382fc6dbadb218a8585f3e31ab03af796cb
96 Risk Score

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/aws?keyword=binomial+expansions+word+problems PDF link annotation
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/7257777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f948583dd34d.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/b9c424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f9d3bc0e3261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_5fa4b814c82ab.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/01e42c08-6e89-4b46-80d6-b5168f5f6b2a/parking_fury_unblocked_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3838ee3e-d35b-481c-9937-42caab08c942/kuwatevevijorovobobesax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f890c4f0-6e58-4a2a-a53a-93700df63e09/24440838766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58097be-4ea6-4f7d-8ddf-4c687790aa3a/a_modern_approach_to_regression_with_r_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e7525d-3d8b-4746-864c-3034c117e57c/volume_of_a_cone_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/bogowie_musz_by_szaleni_chomikuj.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_off000080a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A5 5456 bytes
SHA-256: 5ff0f68b175178c51d6efde00f3032fbed968098c9da2cc3836b35114ede8d4a
font_01_sfnt_off00009323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9323 16192 bytes
SHA-256: dd711b9fc41c71454d8d1dc69bc32203ed44e3fc3e19ffadd43fca78d6579ff6