Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab83d8016f82c317…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 05:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48980fda0404b93b270c58504900a4bb SHA-1: 73ddf8c3ebdf97b563d7c6d5afdc9d2a22842299 SHA-256: ab83d8016f82c317867dc5a4e7fc6268721e88ef6daa394f09c515ff1f090d13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with a high number of distinct external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination through numerous redirects and disposable hosting. While no scripts were explicitly extracted, the PDF structure itself likely contains embedded JavaScript or exploits to facilitate the redirection to these numerous external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://www.pantonerestauri.com/ckfinder/userfiles/files/96892636068.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/96116341722.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/80723753921.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/mixifaborak.pdfIn PDF document text
    • http://keitbg.com/images/files/12956181814.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e71d41f789575e9c005103fb275777d2/34644252874.pdfIn PDF document text
    • http://marymo.ru/uploads/files/vamatalebitipiboweposugi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61939580706.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/26258775364.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/xuxirapilavomorepi.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109230110574348.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f374ea9220---65965836267.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/parulifajumorureposepipe.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/zubamanulimameva.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/53176596115.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/94352909602.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/10665979620.pdfIn PDF document text
    • http://shopabrang.com/images/files/tevigaxugawuxitigokamiwig.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/fexokisirodewon.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/wadud.pdfIn PDF document text
    • https://birotex.rs/images/files/bujawunawabago.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/10572196416.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_D7321C0F15E400D3.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/46862242673.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/55025462122.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/31588206609.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/14463092291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=world+of+dance+season+3+watch+onlinePDF 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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 15008 bytes
SHA-256: a6f4a8440228d425538bf63e130e65f58c78f50f90a60711ce9e924912a498ad
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10824 bytes
SHA-256: a837d7ade4adfd60fe303032cfc17724d31ed37d650d636391d3d22f6301f281
font_02_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1