Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27044c93e39cdac…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 10:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 716acc25ff145b12ce9dfddd43ddb8dc SHA-1: 93b45c226563a360fe144e6184e2a17171ed753e SHA-256: c27044c93e39cdac5910bdcfb15d8ef0401b058e5775e2e8ba9c9605e44cda7f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm of 30 PDF files hosted on 21 distinct domains, suggesting an attempt to obscure malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://xutricolor.com/uploadfile/files/nupekemunetesesapogeluk.pdf In PDF document text
    • https://chupwo.com/editor_upload/file/61847804574.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/xinukirupeve.pdfIn PDF document text
    • https://totounited.com/contents/files/46745085508.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/6382482125.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/67172761539.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/63660229007.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/toduto.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/didobeluzo.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/63089917940.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/14638592759.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/mapotisudokelu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/56894078941.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/76978169045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f19827270---54581236251.pdfIn PDF document text
    • http://technocom.pl/editor/file/wobazozavepo.pdfIn PDF document text
    • http://dnepropress.net/files/file/punedukusuzirunuxuzu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26081c47f---wolifalopetemexul.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/davumububoro.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/gidufo.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/nuruzutevunavofaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pardes+full+movie+hd+1080pPDF 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_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 11112 bytes
SHA-256: 8554b98d3878a6c61c4b2867a9b1771d6faca3168e6868190bddbcbc6c3714be
font_02_sfnt_off0000fbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC6 19544 bytes
SHA-256: 1691ce8db9ced703732f4220a2104a78968dedeac68013087056902ad28590e6

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