Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c917ae8c847dd1b…

MALICIOUS

PDF

75.4 KB Created: 2021-10-07 18:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f2082647fbce2973649ca81cfc891f7 SHA-1: 76307cc8e30cd72500445b8d3dcab5fc6228de7a SHA-256: 4c917ae8c847dd1b58c404454c9cdbfc13585e54be57535f7e9695e1d6743336
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with many pointing to unknown domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the classification as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://riverhouse.at/pcms/content/file/jiwagisukufofokamoji.pdf In PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fifutil.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jomozibawevij.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/76961682240.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/38239121552.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/80769875724.pdfIn PDF document text
    • http://asid.rw/userfiles/file/59316580725.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/piwodebotugoki.pdfIn PDF document text
    • https://banifatemeh.org/data/file/pozofiwinagubazoka.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161408845f41af---mupasuzunibuful.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sonazafize.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/betixebutavusevogemoxerel.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/bowijiw.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pemeboninalenuxo.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/kibavewoxuwofomano.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/kafete.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/6340091042.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/46087498251.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/67861809849.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/97588207759.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/takanezivirarozerovu.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/fogijer.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/86640052895.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/rovexovulewuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+procured+in+englishPDF 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_off0000c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 10896 bytes
SHA-256: 295ae2d332153811dde365f7f80b650d88ffedbb7e5fb752060925fd8cfc76a6
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 17308 bytes
SHA-256: e34f855ac4362822bf67572ea8ddf263612026f03ab21b881e95430ffbf0474b

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