Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca76317e46b78569…

MALICIOUS

PDF

80.9 KB Created: 2021-03-04 05:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a50c00d4dea98feeff8ab47f24074a6d SHA-1: a5b194dc6d156e6efe936ee5e3a0750c9310f433 SHA-256: ca76317e46b78569aeefed1fef3c20ff2d0c2554c957c4c4079f5e04ceb50dbd
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically highlighted as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely attempting to redirect users to malicious content.

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://pelibifir.ru/strik?utm_term=bluebeam+revu+for+ipad+cost PDF link annotation
    • http://vamekujo.66ghz.com/11643675515.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/bafaxe.pdfIn PDF document text
    • http://xasunibi.iblogger.org/the_falling_man_other_photos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/toketajolezumi.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/dbpower_webcam_software.pdfIn PDF document text
    • http://defipezisezujor.rf.gd/41103344993.pdfIn PDF document text
    • http://luvewon.epizy.com/tivujuru.pdfIn PDF document text
    • http://vububogux.epizy.com/wotilevexivuwufufob.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/mtg_books_full_form.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/gilixujobapabezaxuman.pdfIn PDF document text
    • http://laxozoz.epizy.com/47202013791.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/minecraft_survival_island_seeds_pe_1.14.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/ballarat_tv_guide_saturday.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_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 5548 bytes
SHA-256: 7e168822367f5f5fcdbfff04b267713d53b782a23fee44ce22e57e60f72b5d87
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 10772 bytes
SHA-256: 653076ed4026eb9d3574b07bffd3ea484daf1191924b3e6010bd51a9585919f2

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