Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ed7077c7ff1899…

MALICIOUS

PDF

82.1 KB Created: 2021-03-10 09:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 404f86ac4b9050425ae01e2674040267 SHA-1: 8f0cb7ffb26030bf9f69fc373eefe417a56de9e4 SHA-256: c3ed7077c7ff18992bd6736c13907f0ef0dcc932caebea18bda879bca6466bb4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=simplicity+is+the+ultimate+sophistication+original+quote PDF link annotation
    • http://apparentlyopt.com/59057783526kbo6s.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/pebibufo.pdfIn PDF document text
    • http://robertferrell.net/norma_iso_14000-1jw8ja.pdfIn PDF document text
    • https://vifewilepame.weebly.com/uploads/1/3/4/0/134012930/2606084.pdfIn PDF document text
    • http://bioforce-co.site/onkyo_tx-nr_636_4k_einstellenouhkg.pdfIn PDF document text
    • http://helper-badges.com/school_life_simulator_2_apk_downloadggbt3.pdfIn PDF document text
    • http://reduslimitalia.site/watercolor_painting_lessons_free_downloadpierr.pdfIn PDF document text
    • http://greyfruit.space/colligative_properties_of_solution_worksheethg3t5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_1e1273b6f8f94a8c90fc24c0023e5f3b.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_5163548845a741dd9c698120354773e6.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_9a51d1cc001a41d792bf8c7014a1e01e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/48974071630.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/pibolobebajosibu.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/lasagna_sheets_fresh_pasta.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/best_korean_novels_to_read.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_6b24e28d7a124cf8be772a4e589e04a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/kaxumekupebaxefikel.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_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 5676 bytes
SHA-256: 419cba826b300633c4432ea51c2c8161f274c5440b4fba06d2350be0db196017
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10976 bytes
SHA-256: 7bf670c15c7ca35a7efa1cb6717fbf8d2b4fde1cec80d7767e282c024c76c48c

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