Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce90652f68822777…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 14:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fcdab56932d939913733c7fbd399611 SHA-1: 736f430dec36aff127b6aaab2a138f95f75e00c1 SHA-256: ce90652f6882277769c732a2937d67959161c2dfe0c0906e307eb6426cd36db3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent, potentially involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://marblo.com/app/webroot/img/files/39306960185.pdf In PDF document text
    • https://paymentor.nl/uploads/file/vedenevaduz.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/karisitomukakobukuwu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/70739134510.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1612f863e1be8f---24043151351.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/58886303786.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86016fbc3---wurufikovava.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/fuzogopomemesa.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/kotuvivu.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/47433433077.pdfIn PDF document text
    • https://kawanmto.com/contents/files/piwukibivofezo.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/rotibilasul.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/safodobamevixofok.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76451238602.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zusovejelozu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sibowokitir.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/laxazajibi.pdfIn PDF document text
    • https://cartolmania.it/file/1815050773.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/wetirepamarumed.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/tawab.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/87232831622.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/gijelararafonigifo.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/16005754849.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/51001576712.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/bigebikave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=robux+no+human+verification+realPDF link annotation
    • 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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 17700 bytes
SHA-256: 036887a97e55a623a559ad5a8f31554b473cb4bf69033a14df40a259d89ebc84
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10884 bytes
SHA-256: 22110c9655a2b3f27736245225c5b3eaa500133992eb21201adcc1e3a4097e91
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1