Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90ca2e6e0b29f8e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 04:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78800b943473b44aac8c5ae8dcf45f29 SHA-1: 7415f5e550377ba061cb1a9b69a5dc1ce3dbaa39 SHA-256: b90ca2e6e0b29f8ebe50dc9968d6c7883e66742ef732c184ee02794695221e81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to external domains, suggesting it is used to redirect users to malicious websites. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=meilleur+jeu+de+reflexion+android PDF link annotation
    • https://ljlconst.com/admin/images/file/bevaxapogekisixu.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/8311132591.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/98223029283.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/39894343757.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6a07cae193a5061f9047a61e9867a592/88138475478.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/wibimusuzogaxogojoruwel.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/sexamolanoxopibewoxixax.pdfIn PDF document text
    • https://mikludava.lt/images/files/9072804506.pdfIn PDF document text
    • https://j26clean.com/upload/files/93122219430.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/52807857594.pdfIn PDF document text
    • http://taociren.com/upload/file/210903172853915752jpueek9cme65.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/9493628733.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df7690b31---57649885699.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/25787672028.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/86482626898.pdfIn PDF document text
    • https://sambelteri.com/contents/files/58605453376.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/54116592228.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/48039179566.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/72679122845.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/gugesajup.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/zuludifegexelu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/72373464156.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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 10404 bytes
SHA-256: aaeb51b13d8df9c1352d7cdab7860935540a7fafc2036e8936e69bb0c589995f
font_01_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 22036 bytes
SHA-256: d247c3295178a5158171d07c50c5a1f2245545b33f66476042a8d6dd030aa368

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