Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5dec17c1132bb3…

MALICIOUS

PDF

74.7 KB Created: 2021-04-23 23:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bfce49a99f0eacad3b383f9c88fb7b12 SHA-1: b928ed7d114176bfc86b36396191b696777f5628 SHA-256: 9e5dec17c1132bb347a7390c3c64844398affbc44d8c39ded6e1d66d9634ee28
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or SEO manipulation tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple external URIs strongly suggest this malicious intent. While no scripts were explicitly extracted, the document's structure and the numerous URLs point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/strik?utm_term=rip+curl+maui+mini+tide+watch+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fcc45e64e97a.pdfIn PDF document text
    • http://fotobaruti.22web.org/snow_report_coronet_peak_new_zealand.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5feeac8240af2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ff6347f0d93d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fdfaa4fa0beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_605649ad418d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_601bb2c81ea64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fcee02e6376d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_601aee36dd0da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujasulo.epizy.com/borat_full_movie_free_mp4.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/tuletivotarupu/amazfit_gtr_watch_faces.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_1ff7a6d723424be391b13578519fc2ca.pdf?index=trueIn PDF document text
    • http://wisigisovet.rf.gd/fenejelaju.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/free_excel_home_expense_spreadsheet.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_82804b4540844675909282c0a528b29b.pdf?index=trueIn PDF document text
    • http://podawixixuxon.epizy.com/kenmore_washing_machine_model_110_parts_diagram.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_4d77e767a7894cfebd1607c477944efd.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_79880e94abae4056bf822640f14f3b37.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_6c030df3450f459ea5ce629222c5e694.pdf?index=trueIn 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 5412 bytes
SHA-256: e81f00e985c662b1e05ba7bb73c26aef2379e6fa02d33efff5282a0f4d197ebe
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 10980 bytes
SHA-256: 02535cb2d26efd18a7a187d0f966a834a394821c765f2fa43804a4a924c2098f

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