Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d5f5d355e1beca…

MALICIOUS

PDF

79.1 KB Created: 2021-03-09 23:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fb387aa75bbc885a3823215995143eea SHA-1: b0e9535e07aa73fcfb576217085590d1818df1c1 SHA-256: 73d5f5d355e1beca0d00da3b5a6706939b92d2bdc90acb65af1b90fa24cf59c3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=poisson+probability+distribution+examples+solution+pdf PDF link annotation
    • http://republvinb.fun/logitech_k400_plus_vs_k400ri2f7n.pdfIn PDF document text
    • http://infonewstravel.com/87402809609j5ide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_602e215f009d2.pdfIn PDF document text
    • http://re-capital.ru/bow_tie_pasta_recipesmoo94.pdfIn PDF document text
    • http://logvoz.ru/human_resources_assistant_job_description_templatemdbis.pdfIn PDF document text
    • http://wordsidepost.top/817536251617d7yw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_603e86ba6d272.pdfIn PDF document text
    • http://effektzhizni.ru/sony_playstation_vita_16gb_memory_cardeoazb.pdfIn PDF document text
    • http://0fruits.space/tovamiraravopukeduwogifh733n.pdfIn PDF document text
    • http://winoorama.space/fonekokejpqze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fdae46ed7124.pdfIn PDF document text
    • http://hotloveme.online/85141194301ypcgs.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/1d3bbd5d-7b76-4f94-b8c5-2b89842141fc/nateputuxofupisox.pdfIn PDF document text
    • http://lemibutudigosuv.rf.gd/datiwipizufake.pdfIn PDF document text
    • http://fujesotes.epizy.com/debop.pdfIn PDF document text
    • http://gilikasozomexo.epizy.com/animal_farm_flag_symbolism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d240fb03-5c3d-448d-9c0f-9d724ca14662/54266277644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0122099-9036-4bfc-a667-ae55621e4044/61442532718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc3ff204-942d-43e2-8b74-ac167a50cd38/74097753628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775f27ef-5acf-46d0-bd46-5624726de335/bugaveb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf0a141-4069-4fde-8c40-7f304b4cc2b6/garmin_nuvi_50_problems.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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 5496 bytes
SHA-256: 2bbdea4677eb0b9c6515df56eb60b3db81a1c03e9038680f62b26e99c94a4b54
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 10512 bytes
SHA-256: 73d55fa479eb869c4d20dd5bb83f960ca0fa6de984828f6b9527ab3a7540df02

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