Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e10891f3c7232a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 06:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eca280eda168fc489cf5765576f7039b SHA-1: 3fb0395daa712e0e5eb3db7102fdd0e14b6779f6 SHA-256: c0e10891f3c7232aeaf6606b4093d15f801b636c1657b86e408d4b991c508229
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous external URLs on disposable domains, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm characteristic strongly suggest an attempt to redirect users to malicious content.

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://queure.ru/uplcv?utm_term=can+people+see+who+views+your+instagram PDF link annotation
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/39458594439.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/givewutidoliwisajak.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/23651559171.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/senerafineremofosivaxera.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210905032948_01w44k.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/5950045783.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139319178377---xasikazefe.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/fuwebatudojipebatijewaz.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/18197392633.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/sarefatitejewebowevige.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/40645825639.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0cc3534d---felasalaputulozatev.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/84527357360.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/58582184358.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/63513900161.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/fukovexidinuripu.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/671aa0e1a809618587652fb5c7a010e3.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/73671004412.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/rujigob.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kekebafawepibikulakuv.pdfIn PDF document text
    • http://yongqingtech.com/d/files/34429308816.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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 11096 bytes
SHA-256: a3280ba917cf2e16a6f2b9ae87e61adf146d4b612b0b0a666e14d23050a2d298
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 17428 bytes
SHA-256: ab2c87fd24e5652ed99fc9b035ba47a67d3f91e9dcfd872d3ee5c64dab56c170

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