Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bc6c6a3af663e9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 11:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3dc8fbd8f018cf130d68526d608351d SHA-1: 1bbd7920e581b91736a9bde3af99252b3ac9e89e SHA-256: e7bc6c6a3af663e94f50606df4eef93029a6919847a7f1b76d2b3a7feb3a5dd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of manipulating search engine results or directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=keywords+ranking+check PDF link annotation
    • http://terezszilvia.com/images/uploaded/file/sizeda.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/rexab.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/rinisivu.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/zaridi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/25794688668.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/9614468263.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/15170021485.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/razivovogewomovoxazode.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210909120238.pdfIn PDF document text
    • http://www.bash.cl/media/file/89757315567.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/xoxawo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/sosevokutojenez.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/naberatapoxutuvaba.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/62871918942.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/56608186556.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/70914022444.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/60466393278.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/sikuzofesu.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bisuro.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/2133950973.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurinisalinivuxetasapip.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/93725949510.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44b63c461---nejelididewepozetumez.pdfIn PDF document text
    • http://special-pharma.com/upload/files/fatemizerekojedam.pdfIn PDF document text
    • http://palami.by/images/file/teditajizujirizulatenu.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/bekexavegemotud.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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 18160 bytes
SHA-256: bb1d1fe44da563f650cb829c985370e5368db9075e60524eeeed101c075f1c52
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 10788 bytes
SHA-256: 3d57457edc179a6386f085007d6bf84c522ed4c933ec768be3504894cb895c78
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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