Malicious PDF — malware analysis report

Static analysis result for SHA-256 51444a60d5572c73…

MALICIOUS

PDF

67.3 KB Created: 2021-09-09 15:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eea45eae6254f084a94a6b15ed9de6ac SHA-1: 9ea8cd70bf395dbf771112a54edaa9054cae1c6e SHA-256: 51444a60d5572c73d96b296aecc0788ce8153ab9d71e4a7dc3a1c1bc8d4b8ca1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://flexinform.com/hirlevel/file/78950550308.pdf In PDF document text
    • http://elesi.eu/fichiers/files/toxebizapanuwufa.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907234552_g171zt.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/nufowoxaf.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/93673138461.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/39973741782.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/88778406547.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/fupolitezagi.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/78024958153.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/kaxolajimevekoxi.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/woxetar.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210901_91FBB54AADEC6F41.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/55432803524.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/gexewigavazatedikexar.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e8ab31be5a302bf2f94b34a1c77840f/37418180166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+big+momma%27s+housePDF 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_off0000a645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA645 15972 bytes
SHA-256: eca7fb4c6337dfef52cc99dfaf8cce8f462c3aa013111900be9500214ed5678c
font_01_sfnt_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 10696 bytes
SHA-256: 7061708e35a92191277747354b3e4520602b7d0c54655280735dbdea0ebe13d4
font_02_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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