Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d45147e6c9375ac…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 13:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa16b224f9efd98c6518787df05073bf SHA-1: a9951e4756373fb94d69389f7a97f6376880e101 SHA-256: 5d45147e6c9375ac59ef4ee3b0b0068fecdff6afe129be00d79a8be67f2ab896
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The file functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which are associated with document hosting. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613488b019ed7---5219709024.pdf In PDF document text
    • http://doanekeyes.com/userfiles/docs/29191252441.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/rujunutafupiri.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/50470973493.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tazasofizun.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/15971743907.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/menaji.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/93115452971.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/texedimudozizisadivo.pdfIn PDF document text
    • https://architektor.ru/uploads/file/dikexizimidoratud.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xetatap.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/manifejixu.pdfIn PDF document text
    • http://retailcop.ca/files/24174663983.pdfIn PDF document text
    • http://devison-matras.com/upload/file/41160784594.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/85053079382.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/lolakanom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5130394514.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/sukajasutifavizepisedabom.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/nulovajufewuvizulawuvumo.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/63052244983.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/80644902659.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/parukigizebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=watch+football+highlights+online+freePDF 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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 17988 bytes
SHA-256: 32427e33d83efb582175377a10e68c2ea952d729ab3a0110824beed5d060eac6
font_02_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 10748 bytes
SHA-256: 194f85d5fbaa53d3c05dc21f662cd0daa9340987887a593c59fcbaca622f25db

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