Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8cb20bae55d9e6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 16:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83641880a264bac4e0702491fb65e9bc SHA-1: 579dc607a1e67192356ae5aeb1eb645f7a3aa5b1 SHA-256: 2e8cb20bae55d9e60c3226432a08734a83f19ec671172d1b13c7dc2ccb3241f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a high number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coaching-jk-academic.com/ckfinder/userfiles/files/94364247289.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161392a273c2fa---66864305419.pdfIn PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/50567023226.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/jezirodinikemo.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jatak.pdfIn PDF document text
    • http://dzbnf.com/upload/file///ponaxura.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/xekiguzifuxurulexopad.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/danogowezebexidumag.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/gajigigofadazipusiw.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/67292168768.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/96273207062.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/94662630019.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/29435079014.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/lumaw.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/kitoxe.pdfIn PDF document text
    • https://tierlistei.ch/downloads/gejezaxefipogugu.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/88181380631.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613473c1ddaf1---28235054216.pdfIn PDF document text
    • http://belv.ru/userfiles/file/93761671496.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/88998966400.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/44047769150.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/82022347618.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///bonaxegadasofetopoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+french+open+freePDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 10264 bytes
SHA-256: 18346382ba2f8474a320726626303b11e65ca83a09fc66b36ecd273f8e83455b
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 17524 bytes
SHA-256: 1c859738011014c6ad0340b9e2c5bcb91050525c685427ce32de9bc11974e60c