Malicious PDF — malware analysis report

Static analysis result for SHA-256 9294bfe6f90991cb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 07:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4bf8f6c21bd18b68b1fb8680d335f55 SHA-1: ba4ed101a980d123493a2ec930ada89c0ee6850d SHA-256: 9294bfe6f90991cbad5b6bd27ab33237ebd9f05b5a6f45cf8e71460abdc58d86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature of the document strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=change+your+play+store+country PDF link annotation
    • http://metisentry.net/ckfinder/userfiles/files/pakuvakagepunenegu.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/43277965331.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/90292780700.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/kusimojafizisenarixasakan.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_9B3BDA9C21BF574F.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/mixubitibelijixoxotopez.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/63913172866.pdfIn PDF document text
    • http://mamam.by/upload/File/file/momilefepitasisotoguvuwub.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/35277426942.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/61950987674.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/73051961450.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/bunod.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/58688720307.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/36316137942.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5814baf0fc244f191a26d31b5559aa8a/romodutalizawez.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/mojakokok.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/sesefitofawitilazisarel.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/sekomulezaguwafipevovo.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wojegifobogoridedibap.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/zomunojilujul.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/61684693257.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/jijenulokupuj.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10804 bytes
SHA-256: 219dfea5fee55f8e80cb87f8bb0bd7248f33c75f38d36623ffc76d38d414ad49
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 17400 bytes
SHA-256: 5b20e95b38cd5bbec06e40d370cac2e89f5219522949f03f5a04bf7f8b32eab7
font_02_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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