Malicious PDF — malware analysis report

Static analysis result for SHA-256 2489db62bbb3c85c…

MALICIOUS

PDF

94.9 KB Created: 2021-09-08 21:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e3bfff20ce7d3651796264585e8e40e SHA-1: 2a3282370efba0dff1ff07d3b9c234a60ce6fce0 SHA-256: 2489db62bbb3c85c48eeaacea53fa61aeb4a5b7c51770ce8ac68142c66cd9503
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=definicion+de+revision+sistematica+pdf PDF link annotation
    • http://poongdung.com/FileData/ckfinder/files/20210904_8E854DE5CC55C7FE.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/76865150191.pdfIn PDF document text
    • http://tabletopad.com/images/file/zuxuledetolemasaj.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/sizagotuzulipimememug.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/vuxavamowitajuze.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bivasulumafexikanosaxoten.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nuwasunefotikeguwe.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161333920ca48d---zidarelepuduwuvegezava.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/dagojamadekov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/t39uucjrvtock651cr4rt00a24/60224264746.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/dipusumunesega.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/16241964784.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vagosonisuzanovikire.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/lusitavebanoponanuvabog.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/wakitakagupisota.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/mifidinesa.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sujakutaji.pdfIn PDF document text
    • http://salkim.com/userfiles/file/zupebetuwegivoxa.pdfIn PDF document text
    • http://aprt1day.ru/file/vajulitomamor.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/63539116269.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/23786486331.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/542628728.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/pufufusux.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68907516517.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/89031261987.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_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 10800 bytes
SHA-256: 475f333e537c3f3ba0fb4b6ea1be733989da21bf4edc452749d871dd2932132d
font_01_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 20028 bytes
SHA-256: 61ff77d68bfb0beb406951dd28933b9cd8eab6e33fe3f242507b351397745eec
font_02_sfnt_off0001554e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1