Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59ec6b0765fd274…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 22:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 315efabcf538ca90d712d18c4dda2778 SHA-1: 3ae8932b0cc575f1d0870e3919e001efcb3e62b6 SHA-256: e59ec6b0765fd2748207865f9ea9d98e8b7c70b917361d494d50e370cf90fa96
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable domains, and one URL specifically mentions 'windows+upgrade+to+windows+10', suggesting a lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=windows+upgrade+to+windows+10 PDF link annotation
    • https://dildendilecevirievi.com/upload/ckfinder/files/31117833027.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/titajaregovajovuve.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/fojazuxewologed.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/6500435698.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/nuzovepejaluvo.pdfIn PDF document text
    • http://citty.org/images/uploads/file/84834465721.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/12339711528.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/vebitofuboxeredowazujax.pdfIn PDF document text
    • http://climtech.com/files/files/2195397316.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/36847105495.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/57608316895.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/50832324315.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/nesigegudebite.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/13de867251806166576e45316684d5aa/kuwozurir.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/23626697391.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/62097575363.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/45008987650.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3eceac30f8a4f0d7648c7f1ac73fd29d/jomibu.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/betawivipijev.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/20390218021.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/lazok.pdfIn PDF document text
    • https://blogsma.com/files/posefitavujuzog.pdfIn PDF document text
    • http://spharma.ua/files/file/wigavokodakoz.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://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_off0000aef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 16692 bytes
SHA-256: 264f9a1345229703baf58a6bd76552197242675eab8495c346edcd0ab3480498
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 10876 bytes
SHA-256: 347d0f64b9a911f9dad1b918ba75d8b1e3e482ca3b35d06b9105a6fc6d1487aa
font_02_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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