Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d7c7ac434e1056…

MALICIOUS

PDF

44.9 KB Created: 2020-11-05 16:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7bf20b4f759305b4b825135de79d78ae SHA-1: d592d3c0112669f8f6f96471b2dc48d9358276c7 SHA-256: 51d7c7ac434e10566a834e7443c75cd3fec6b10d52a4706fccdbf4823ab8a341
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=generac+owners+manual+17kw PDF link annotation
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/f0451.pdfIn PDF document text
    • https://bufibefoxoxopij.weebly.com/uploads/1/3/4/4/134489975/a47365864337.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/pawibuvukuwubib.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/7969333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nosepevozux/my_canisius_edu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/business_environment_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/morphological_chart_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/steps_in_process_of_science.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/new_format_of_audit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/4.6_special_segments_in_triangles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/mupapona.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/35553569557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca11b54-426f-4bf3-ad9e-418811dfb731/86033641594.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 5016 bytes
SHA-256: 821fd789c8a4398bd9050376b1010c39e27caa880a0643fb594fa105b06f8d89
font_01_sfnt_off00007318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7318 10852 bytes
SHA-256: ad19126c69d7ab4d3c2ba0300ab1a77fc8e3af42849e8e74f85c0bf69e7f6a8e
font_02_sfnt_off00009771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9771 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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