Malicious PDF — malware analysis report

Static analysis result for SHA-256 616eb323a3fa9479…

MALICIOUS

PDF

73.9 KB Created: 2021-06-03 06:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af30a72c6ac2c47f7c1e719317ed733e SHA-1: 8fd31fbd7dcd2bece74132ed627cfb4624ac765f SHA-256: 616eb323a3fa9479e413d5cdfe62bea288a88537409ccf6ea7c160ff5d8fe9f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an intent to redirect users to potentially harmful content or phishing sites. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards a malicious redirection or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=godfather+theme+mandolin+sheet+music PDF link annotation
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/dapotixopet_vixed.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/torafelubowom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_602683f31eb95.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/614426.pdfIn PDF document text
    • https://sebeguresed.weebly.com/uploads/1/3/5/9/135966133/feluve_sofuwitot_mozilekiwek_daxaxa.pdfIn PDF document text
    • https://xatosupitoso.weebly.com/uploads/1/3/4/0/134018334/1176814.pdfIn PDF document text
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/1438283.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/fisoram.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/lipevatikoful-sedadiwi-rekipan.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/zokoke-kosesala-ruvisokotupo.pdfIn PDF document text
    • https://bubemufebe.weebly.com/uploads/1/3/4/4/134470009/warigexuwuka-zosamekariba.pdfIn PDF document text
    • https://modagifamu.weebly.com/uploads/1/3/5/3/135341464/vuxasit.pdfIn PDF document text
    • https://nanopimage.weebly.com/uploads/1/3/1/3/131398258/xisesej-zadiva-subos.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/e763a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_60330bff8b5ae.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/f084f7ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422454/zarobirijebogojepomejedid.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/w/file/fetch/144514497/moged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdcd249-c024-43f9-b876-1485adee4d4e/95285614677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9e4ae3-a0dc-4ad4-ad18-b9a0a6a9d720/53311293663.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_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 5292 bytes
SHA-256: b67403e73a95a0a6966117c54f45f72e6910ad5f4a9c45e7890f69da0f6ad98f
font_01_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 9992 bytes
SHA-256: 4c725a6e8b388a6018c3b7623875217f2c0a2ec3696df9d98c59e6ccf3780639