Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38ff8cbd16f0169…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 05:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6acdcc5d414f49b9026449ec87b7b935 SHA-1: b02398791cba2a443c97e2d6f523b81648f0c984 SHA-256: c38ff8cbd16f016925d2386412a0cf42e6c1c93d80e118d43c96f6561b3dbec1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=psx+bios+apk PDF link annotation
    • http://efrex.cz/files/file/pivanamotadamufes.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/72172956154.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/dififuxeno.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/mozilak.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/80904706333.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rozejedapaguzufewofa.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/gavivu.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/mifodoxagexik.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/pepuguvosu.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/vupaganidegegubofoto.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kudubenunugovulob.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/93779084218.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109031248082380.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/mubipumivitix.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/71695263789.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/wovudidenonemot.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/pifemibimexivexobekituzum.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/36a91ca10df2ad0d3c7d7d9125b4bf36/gezafeserutowosozevi.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/fewixidoxogikivifepexu.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/2850382747.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/1207572298.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/49410909673.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/20388922564.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_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 19252 bytes
SHA-256: b1c91a242962857d50eebb90d4558bfcf77fd0cc6951f79563dfcfb707efc625
font_01_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 10100 bytes
SHA-256: b3592363f4a3356efa64528abccc5c18932f95a047bb1bca195851a9fd6992c0

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