Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa93b494a1508039…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 19:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bdc9cadad1c723f7e5195894ed6659fa SHA-1: f9c4b2e68b9ba861c467d54b180fe8a0aae726d0 SHA-256: fa93b494a1508039fb7adc9beb3a02486d5bfe749b9b56bcd9dafd4ad3b473ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing duplicate objects, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=swimming+partners+short+story+pdf+download PDF link annotation
    • http://cross-winds.in/upload/contents/images/images/tuzukitudisiretaro.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/zibapo.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/16279858720.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xezuzizojonavetugavozow.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/vugabapab.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/salimafefipewe.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/39910467592.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/badomexovug.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/37419938733.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/20174308984.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/jobisepefaji.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/48758544810.pdfIn PDF document text
    • http://chamaeleon-produktion.cz/www/files/file/63348405595.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/5881378415.pdfIn PDF document text
    • http://www.bash.cl/media/file/wedokes.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/32061656176.pdfIn PDF document text
    • http://csp.hu/editor_up/wizufukojazusoxed.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/dotudujelakuk.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/90300581579.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/sodoruxadugopalezak.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/80740467482.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/54296479129.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/bulesuw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s85cgomc8emunnl3hooo2kh6o5/muvuxijep.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_off0000ae0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F 14724 bytes
SHA-256: f3b46f983e9b6a64f275f12cd69dd0a37364beff873f5ebc59be79409c265eaa
font_02_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 11220 bytes
SHA-256: ee658d62a1b37c18d92aa1439303c4eb0ecccf6e9a6e3baa1557f895ae1f1da3

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