Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da9235897a2bb9d…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 09:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dd681465e4f9f7a5051b745588a95abc SHA-1: 04517f5327203c635d0eb437ed70951de28d4d04 SHA-256: 9da9235897a2bb9d198edef99112e402bbd793353f26ca665065393983822c8b
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs points towards an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URI findings are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=accouchement+dystocique+cours+pdf PDF link annotation
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/5ce292a7f5b.pdfIn PDF document text
    • https://kagojidumone.weebly.com/uploads/1/3/2/7/132740327/ratode.pdfIn PDF document text
    • http://winwites.space/6045548069ndji5.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/85027655416snac0.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/lejamaguluxerekofew.pdfIn PDF document text
    • https://nixetamusizag.weebly.com/uploads/1/3/0/7/130740210/5341662.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/bf4444ad1a6e.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/17272677420.pdfIn PDF document text
    • http://velimogoliti.iblogger.org/mawebiletibupeloma.pdfIn PDF document text
    • http://fabulouss.space/monkey_business_illusion_mp4_downloadfm9b3.pdfIn PDF document text
    • https://tekagegi.weebly.com/uploads/1/3/2/7/132740997/836592.pdfIn PDF document text
    • https://pajolabu.weebly.com/uploads/1/3/4/4/134482361/vizode.pdfIn PDF document text
    • http://piredvizhnik.com/pearson_interactive_science_earth_s_structure_answersnzcle.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/electrical_ansi_code.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/38331821935kmu4z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilagikudi.rf.gd/business_intelligence_software_at_sysco.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/citizen_wr200_change_time.pdfIn PDF document text
    • http://nisoruv.rf.gd/how_to_solve_multiplication_by_vedic_maths.pdfIn PDF document text
    • http://komadolosa.rf.gd/voxamugozoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/how_to_speak_with_spirit_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/que_es_enfoque_psicosocial.pdfIn PDF document text
    • http://xewojof.rf.gd/south_carolina_road_map.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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5372 bytes
SHA-256: 33d1c5df823bae286eee470dc2fe9bc92f6880a431fadbb305667240f343b1c5
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 12544 bytes
SHA-256: 43ff77b4c5001f93275fc881ec14d4e7c90894b88aad24dad0e5d539ca97da69

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