Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c9e86241e81ba4…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 18:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a06b4302d443694b246dbfaa2153a6ae SHA-1: acc90d70c5d1cbe2316aafc5cbc1cb63d97d8bb7 SHA-256: e3c9e86241e81ba4d16129d6b990f0507346f592689ed6ece775c079155dfbbb
286 Risk Score

Malware Insights

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

The PDF contains an embedded script and multiple external URIs, indicating it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script likely facilitates the download and execution of a second-stage payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • 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.
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/wix?keyword=college+of+charleston+off+campus+meal+plans PDF link annotation
    • http://muldwych.com/special_ed_teacher_assistant_job_descriptionmssbh.pdfIn PDF document text
    • http://dommasters.site/21088229510i0oeu.pdfIn PDF document text
    • http://pornbustyvids.com/dubimiwigetofuzorajenbu526.pdfIn PDF document text
    • http://com-copyrighit.com/sheet_metal_fabrication_jobs_in_dubaidotg4.pdfIn PDF document text
    • http://vuwadezizubem.22web.org/software_alcohol_120_free.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/tuburorutagenazukovert31a7.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/jalenumuxeregej.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/configure_reporting_services_2016_powershell.pdfIn PDF document text
    • http://zabavnyi-slon.ru/how_do_you_reset_a_bosch_tankless_water_heaterikj6x.pdfIn PDF document text
    • http://energytik.net/pakadugibejavogevixa50hdt.pdfIn PDF document text
    • http://zabavnyi-slon.ru/how_do_you_reset_a_boIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dalotidel.epizy.com/52415456970.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/63303418910.pdfIn PDF document text
    • http://kesekerezox.epizy.com/bulaklakan_folk_dance.pdfIn PDF document text
    • http://pevunezix.epizy.com/82339508955.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/52223289932.pdfIn PDF document text
    • http://mudatelifawuvo.rf.gd/metabolismo_tv_libros.pdfIn PDF document text
    • http://mijogivuxob.epizy.com/vapifegazarenon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d0fa88-a53c-49e1-af24-702f6bc19aac/miller_bobcat_225_price_canada.pdfIn macro / runtime command snippet
    • http://tapalif.epizy.com/autocad_2008_full_crack_32bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7f0ba9-dbd3-440d-aa7c-5c965631111e/the_drummer_boy_of_shiloh_collections_book_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000099e4.bin pdf-embedded-script PDF decompressed stream script payload at offset 0x99E4 83953 bytes
SHA-256: 49a45bf0c54e7b4988dddeaa8fa28caad1f8292a81e85193101b142f108d7288
Detection
ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
Preview script
First 1,000 lines of the extracted script
%PDF-1.4
1 0 obj
<<
/Title (�� C o l l e g e   o f   c h a r l e s t o n   o f f   c a m p u s   m e a l   p l a n s)
/Creator (�� w k h t m l t o p d f   0 . 1 2 . 5)
/Producer (�� Q t   4 . 8 . 7)
/CreationDate (D:20210318185257+02'00')
>>
endobj
3 0 obj
<<
/Type /ExtGState
/SA true
/SM 0.02
/ca 1.0
/CA 1.0
/AIS false
/SMask /None>>
endobj
4 0 obj
[/Pattern /DeviceRGB]
endobj
6 0 obj
<<
/Type /XObject
/Subtype /Image
/Width 625
/Height 155
/BitsPerComponent 8
/ColorSpace /DeviceRGB
/Length 7 0 R
/Filter /DCTDecode
>>
stream
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... (truncated)
font_00_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5332 bytes
SHA-256: 5c65186e2d0120d63417dfe3f115449926ed76eb0db2efa1c1402d807b408ab0
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11440 bytes
SHA-256: e273a7ff036b64323725571ce23535526d4e5a544464a643e29a86e0820cdfa4
font_02_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501