Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9b8ca35c288334…

MALICIOUS

PDF

38.9 KB Created: 2020-11-08 16:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d1efbc4c7e2219b1bdf379fb1d53d3f2 SHA-1: d7b31d8a0cd4fd40ea6b471f7f66b2f1a3573481 SHA-256: 9d9b8ca35c288334beb1a2a35181b102cf373f86b99750407d5944ae8cfdc91f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=asmodeo+demonio+invocacion PDF link annotation
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/5fef0b.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/tepurufojufumi_muwigewu_juneze.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/7665880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f96cfa6b1427.pdfIn PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/4381323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f86fa7b15084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5f9718d5213f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_5fa35f96297c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5f96d369df563.pdfIn PDF document text
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/pimeditiwebamebeje.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/23b1bdff-a18e-4588-a7da-e6d454d9ab67/bedonizutegeganud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd0e1e8-c0bb-483a-9875-1ae8332d491b/ruvebil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8143021a-c426-40d9-b87c-fdfd8bd59aa2/galegave.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/everything_i_never_told_you_full_book_download.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_off00005c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0B 5008 bytes
SHA-256: 3e21f63873601c4dfbda58419b0e637e0fb4549c147263469698f038b0b65792
font_01_sfnt_off00006d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D06 10044 bytes
SHA-256: 61f8cf2320cc2a610658e9424b6c3f6e4477ff0f2a49edaace1a723baa90fc57

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