Malicious PDF — malware analysis report

Static analysis result for SHA-256 5439f5bee2d32fcc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0794f1111803cc9bbd38e81721f53c5 SHA-1: 9466155d91cfb8e798eacdbd37df858f0fce04e2 SHA-256: 5439f5bee2d32fcc10b5bcc9f3d07935286f8865e2e77421b36a78b1fcba733f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://vertex-decor.com/userfiles/file/3457015007.pdf In PDF document text
    • http://yanarfabrics.com/firma/files/3988228497.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/90047501515.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/62983627906.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/41618182794.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/96872141326.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614d30cac9ccd---majasijupuniwarodaj.pdfIn PDF document text
    • https://dhesient.com/media/zimetupo.pdfIn PDF document text
    • http://imi.vc/upload/files/96731589464.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/rilapejiki.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/buvinujuxajafijudem.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/83412238357.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/pezotazuko.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/rewolik.pdfIn PDF document text
    • http://apart1day.ru/file/30895700771.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/51097440790.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/89845529450.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/jawusitivodefozarelodiz.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364d371f19d---lodisanosivimopodevekadob.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/31054511529.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/furegalamadaze.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/babidito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+free+skin+fortnitePDF 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_off0000aea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 17060 bytes
SHA-256: 33ab079aee3aeff8bf8942f9701d4f14558e04e394bb42d1fb2b5aa703054b11
font_01_sfnt_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10352 bytes
SHA-256: 9b06d68a33e3db0860d062b53d876b426e7202621db97e25752a8f237cbe4647

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