Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fa62a0b3b5f9ed…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 00:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 244aac1c6f9bd5fda74462dd4d204b7d SHA-1: 8a6888784334735f33248de6e3fddf0fd6f1bea8 SHA-256: 92fa62a0b3b5f9ed0ea0f8bf6770e2caa4c6445881a5d9fa730c08ab7a0a5efb
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, likely to distribute malware or conduct phishing. The embedded URLs and the document's structure support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://emanuelarombiarchitetto.eu/userfiles/files/60672339402.pdf In PDF document text
    • https://izyskately.ru/foto/ck/files/fuzuxekodofotaxame.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/91864069656.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/limugubupolijek.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210912114622515455.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/xadugebi.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/lomagijumodozuse.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/84475972981.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/tumiwofokuzemuj.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/mixanesoraju.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/74309963840.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/risani.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/14085884335.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/79979837705.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/61901037290.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed2d4b97a8---59030242323.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161408864bf2eb---92812916529.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/82413982964.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/midubixowoxizujojibiduse.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/97228843002.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/dimuzazisesatifiwoz.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/dabopexesobaz.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/towukevudugevotot.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/74509321849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+1+17PDF 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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16960 bytes
SHA-256: 500013adbeba540e5db7ccd1f2e9538f7197626ebb43fc7e8dceb1d2d2d4e670
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10088 bytes
SHA-256: 563d36fd911668417d798c740956e9a0cb18b4e9e174dec7f663f2d64c1b01bf