Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ee440704889bf6…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 18:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4098c26773994a5b987be62d594b3a29 SHA-1: 9052228a0d0a9a8c20f1646965b799d5912063df SHA-256: 65ee440704889bf6ba2fb8d82e0de20fa0812ec1fb66e1464f23fdc8b1bc32a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to unknown domains, supports this. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bluecars.pl/userfiles/file/sitapixil.pdf In PDF document text
    • http://dautuck.com/uploads/userfiles/file/ximetulolimirubugazijomo.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fivixepewefi.pdfIn PDF document text
    • http://kodemari.info/data/files/34630451578.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/94668578566.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/79267803c2e5d23813c4e034bda1724a/30671855160.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/mabipovurovolupeker.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/20596393845.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/80986384074.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021913_41631_682.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/72742931179.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/10627285187.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/55695084575.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/72336010786.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/33644511120.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bdd9d4775---73296716930.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/towiguxafafa.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/52425042861.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/22161279237.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xozeveguzav.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/netalupitulubalewudevoga.pdfIn PDF document text
    • https://5udua.com/contents/files/67108022584.pdfIn PDF document text
    • https://mauspro.net/upload/files/gidegurame.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/tovoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+build+themePDF 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_off0000cf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 18260 bytes
SHA-256: 639f28cfa1dd67df5d1e7d66ed4f62a2ce73956d41f7460bbe32c97c68cd8626
font_02_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 10684 bytes
SHA-256: 887538a1659ad743d215bf4c67fcdf609d8c2b394a47a963dc9a4f9f27807175