Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed19ce5f7ef28a4…

MALICIOUS

PDF

45.7 KB Created: 2020-11-06 23:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2d52d4c86f67eb90e22c03831e66d74f SHA-1: 2870c4ebf04b0334c26aeb0c1080d7aeed6da2d1 SHA-256: 4ed19ce5f7ef28a4937c8e11d0b81e5c8d4ba9ce8cb632fee9856c356ade4d69
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=obligate+and+facultative+anaerobe+definition PDF link annotation
    • https://nofexozodaxo.weebly.com/uploads/1/3/4/5/134522082/9702005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_5f909e5330fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f904e80d03e3.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/kadijafapesu_donasim_juwam.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/palikuvexake/singer_sewing_machine_parts_and_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3367be9e-d0dc-4abb-b4b9-b2f1401ea7e3/battle_of_warships_guide.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://xijadijuf.files.wordpress.com/2020/11/dvd_mitsui_mdvd209u_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6e0f7f-db25-4ea3-b910-f55b8cd6c72a/baxir.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://pufelaneniw.files.wordpress.com/2020/11/melene.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_off00007081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 5236 bytes
SHA-256: abac2763f62ef209a6fc26c426c9b01bd3ea00036b45810d5856beb2e99672b2
font_01_sfnt_off00008269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8269 10932 bytes
SHA-256: 5a48d2a709a63c292fd1fbde8cfbbff8f875ae13d9fc8bd175d34c54693abc07

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