Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fbd7634aca3710…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 17:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27fc2c05aa111998158c5360abf54444 SHA-1: 75c14a531e2ea971d1ec033fbb19aab17e183ed4 SHA-256: f4fbd7634aca371068cc9a88458178e2fe8086c6e100383da7f5a92872ad98f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious or phishing sites. The PDF structure suggests it's a link farm designed to redirect users to various external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=moviesflix+bollywood+movies PDF link annotation
    • http://majortaylorride.info/images/uploaded/file/29850183773.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dukulukowibeti.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/dasabimexiwatel.pdfIn PDF document text
    • http://cityfate.com/files/files/54136839379.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/14018635295.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/36505813726.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/44507509116.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613148720c17f---sovenanebugerotosunuvejos.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/22088350393.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/kinez.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zuwidojax.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/83559401078.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/75276693480.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/verinijop.pdfIn PDF document text
    • http://ruihuitax.com/files/file/volunonovivudexavazisa.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/93128086456.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/vokefobilapige.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xufoza.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/20376673876.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/41690393272.pdfIn PDF document text
    • https://rotitelor.com/contents/files/60695965550.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/tevifux.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a1aa11da---gizitetibinalidukulopu.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_off0000c5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 18568 bytes
SHA-256: 8ce764d6419dc0e3ba283ac183dd2b84ce8a005257db69bcf53f88730d210af0
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 10552 bytes
SHA-256: 99324f435c6649ea715dba5d44691e3725da4111b86a75a8c68643883e6c0d46

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