Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5d54fb92b7740c…

MALICIOUS

PDF

51.3 KB Created: 2020-11-06 18:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7878c0183a04e8c89b6d558d8317a8cd SHA-1: d94cc897b9b0ba1505bc4bbe141711a23cafdc77 SHA-256: be5d54fb92b7740c9f5eea3227d4b7552bc11a27435fdf578f30a284e1db76f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farming or content distribution schemes. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to direct users to potentially harmful content or manipulate search engine rankings. No scripts were extracted, but the structure and link farm heuristic point to a malicious intent.

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://trafffi.ru/aws?keyword=world+war+1+propaganda+worksheet+answer PDF link annotation
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/1539481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fa1159e73001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f88371572098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5f93d60b92edf.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/5247344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f9261be26d5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fa1041eaf67f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fogisunewada.files.wordpress.com/2020/11/3413958129.pdfIn PDF document text
    • https://teviwuder.files.wordpress.com/2020/11/74816372793.pdfIn PDF document text
    • https://nawazuled.files.wordpress.com/2020/11/sagojisefuvi.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/empirical_distribution_example.pdfIn PDF document text
    • https://sefudizod.files.wordpress.com/2020/11/wagapalaxutaf.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_off00008779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8779 5440 bytes
SHA-256: 4c3202b0793244df3069efe2e758e5337a60480d3b5b4b4bfb3c06936d6d8a60
font_01_sfnt_off00009a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A13 11324 bytes
SHA-256: 344ce742f42c82c684c493ae429db28dd1e60ef3b7db1e4c47aef508a1288c49

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