Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a46829d8adaea1…

MALICIOUS

PDF

80.9 KB Created: 2021-10-09 23:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4c059117758413d4461a2a0b766e42ca SHA-1: b7430f1a6a7924059562bcddb29e77e25f52d9ae SHA-256: e8a46829d8adaea1e1a7a2fb6dee48c691736dd41064fcba1905bb97173ec125
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://catamma.ru/uplcv?utm_term=pain+from+lower+back+to+foot PDF link annotation
    • https://cdmsig1.com/ckfinder/userfiles/files/degotukadujuxizoguxit.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/43623399102.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210920_C433F093C0DD35A0.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/65961413689.pdfIn PDF document text
    • https://signalstrengthexcellent.blunavs.lv/cms/file/65943751391.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d01881559---silifoxurumevabupani.pdfIn PDF document text
    • https://phuquiland.com/upload/files/24374649827.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/sezudujikopedak.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e97eb64d67d8657d4a448b5dd402605/dawixevivodap.pdfIn PDF document text
    • https://badrivishal.com/media/tarozibizexo.pdfIn PDF document text
    • https://qkon.ca/images/file/fupetabasesekesugapapilat.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/tugifiwa.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/50112803143.pdfIn PDF document text
    • https://ebmturonet.progess.com/userfiles/file/rusavupajuk.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kakewox.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/papodebozinoviwovojinu.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/85130537153.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/79042333906.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/39281214207.pdfIn PDF document text
    • http://shesob.com/file/files/tajebetinedefotowa.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/fanofamibo.pdfIn PDF document text
    • 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 10648 bytes
SHA-256: 8c8de9151b5aeabaaf412884f403ab54a16a69265e6eee57f59df024eea64aa7
font_01_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 16188 bytes
SHA-256: 4e5267adfa8c3ec3a06f2e225da2ac563e75aa33a208553a725dd9c2b25501d6
font_02_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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