Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8c69807821fd5d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 03:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82329207371d30c6126c5e6a60f9fea6 SHA-1: 28eb3284cd2549dc8b5f295c28e90f210ed65380 SHA-256: 5e8c69807821fd5da4b45a23e60c95cd9e5a448b135b9dad130b1ce2ba3a36c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or redirection attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=best+android+sms+backup+app PDF link annotation
    • http://elskenecologie.nl/files/veburepabanipevix.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/57740898794.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/52444947856.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/lutubu.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/jawixugibikowomanafevim.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/newegamixukizu.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tadafitejovosabo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/49610356269.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/eb4a230220d8af8480911dd3a00fb0bc/fokam.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/mavotematuvagikura.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/wodozuke.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/14425871233.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/mubemifedemew.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210904122840.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/texafepukovodomexumiwize.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/20703064172.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191451765811.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613994b150784---38271047938.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/vutirakizize.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210915_225457.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/51932142107.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fidonijetofisonas.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/56438498081.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_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 11016 bytes
SHA-256: 176b6bb14972bc597da6146a9e345ee21727a2d8aa4fc5f386bc99e2e54c3b4b
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 17084 bytes
SHA-256: d67f28f50d1751ec745940a2e81e0fa8c0df5bf4e0ab23e9318e090b70fdc4b8

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