Malicious PDF — malware analysis report

Static analysis result for SHA-256 e999066eb3f9d9f5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 02:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af6ed3540e5f7aad38f607772fabe48a SHA-1: f66d37cbdecbc66f544f512fb3ae9f81c1519e1a SHA-256: e999066eb3f9d9f5b7feb88bc5308285781434b380c8ade036dbad8af9480a70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the structure suggests it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://digireg.gr/upload/dolawovuva.pdf In PDF document text
    • http://giovanniseneca.eu/userfiles/files/bubalewomabuwupatig.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/19517819827.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/kapusukedisozeni.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/geduxewupixasokapeda.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/12681164707.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/87207715974.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/17413525449.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/70603408229.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/lilitaviwuduxamoki.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/89185601802.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/kevitalitegilupu.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210908081649.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/38109344545.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/pigofodotuvetuvonulabo.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/tejufudoxefanegesumubijim.pdfIn PDF document text
    • http://cochemical.com/upload/files/fozojipaloxowenujoduzesa.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/gozozewanaboxolevijel.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/90213462797.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/31953598904.pdfIn PDF document text
    • http://getdol.com/page_data/file/lexemixitupa.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/15405591978.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/98028118201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+create+folder+shortcut+on+android+home+screenPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 10916 bytes
SHA-256: 440b8857e13e12b2989c23deabb9f62652511a70dd1301fa0961f7b1a4f2f2bc
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 18016 bytes
SHA-256: 5286ed78ccc651b862036aaca4d5f1a31c979024385d67e73b2ca5bd1f73b1db
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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