Malicious PDF — malware analysis report

Static analysis result for SHA-256 5722aa54d0cf31e1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 02:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb01244babea7f3d367d28201686c2ef SHA-1: 4744c2a350369306c63eb9fcc80adbeaa84a5d6e SHA-256: 5722aa54d0cf31e18b10b3e001e9afd98210203d9324cd02c536400f134c4fed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document contains numerous links to distinct, potentially disposable hosts, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

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 http://ahrestygz.com/userfiles/files/20210912_181247.pdf In PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/81316289102.pdfIn PDF document text
    • http://suma.ca/upload/editor/file/welajuda.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133990c6bd71---44595821756.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/towuvofo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8a1df8b8dd1c997e120332e85ddebf00/15663609243.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/nomofizu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/patunejime.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/48836372124.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/worinajimibewumeko.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/menitojapexaz.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/88077576858.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/54459705769.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/4045823990.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zufinu.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/15563266130.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/lipovuxeraputopezitevudol.pdfIn PDF document text
    • https://apra.pl/files/file/44659611125.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/60269008254.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613f0ef1dc4ad.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/93416194427.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/fesis.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/xeruxezatifegabisixupibom.pdfIn PDF document text
    • http://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/99627410057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=schaum+series+integral+calculus+pdfPDF 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_off0000afbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 14384 bytes
SHA-256: 56fb09fef07a7749fcd4ee8b18f743f7e6399786d6b83b94a6a08f76ef8b1793
font_01_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 11120 bytes
SHA-256: 4a936b8c8c60d5a59d3535da9ae9fa7b203234ffdbfe5b3983fe1a79221d28a6
font_02_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1