Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d85ded3e398f8e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 21:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ede14267a4fe79c0d9203a8de38c4d20 SHA-1: a39c5bc7c8716dabe5c7f4ea2e96ff4fe2f39631 SHA-256: 10d85ded3e398f8efe35200ea7e1dbd32342578d8bc4f0546f58bf0cfc244ed9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://saigondome.com/uploads/userfiles/file/39778528683.pdf In PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/bekexejotenirujo.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/83488361304.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/cftkb56bpr8pp9g2vhom74160s/53156400379.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dobovox.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/visebezumibaxogum.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/roburosagepukuz.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/2159273619.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/49943307533.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/jarakakejizamuravegiziz.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/bazuximokutavepovisiv.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/98743932924.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/dekexowemiseligu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pibebevasozufepul.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/pijaledo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d6b6698b---63930587643.pdfIn PDF document text
    • http://idcla.net/upload/files/detibozixotoz.pdfIn PDF document text
    • http://sentai.cc/data/file/20210903_014458_348.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/sidalefufiduxajogab.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/94916885106.pdfIn PDF document text
    • http://tecksco.com/upload/files/19193070136.pdfIn PDF document text
    • https://keongracun.org/contents/files/felolibezowit.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/76338666563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=nombre+de+los+androides+de+dragon+ballPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10608 bytes
SHA-256: 43cfb5eb7111f13fd56dbc486824d6641075a6c8b39a27538f90c92be75bd5f4
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 20380 bytes
SHA-256: 3decaacbc9c6992889310533bfb5332c3e3a51418cf0bdf2ed8b762c60afa584
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1