Malicious PDF — malware analysis report

Static analysis result for SHA-256 392824505a664a5b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 06:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6eefbc112e37384887a8fa2246a1659 SHA-1: e3a2e82230dff5dcb55a2d97de9c76d02d700c1d SHA-256: 392824505a664a5b44d5d3c0c22a9de2c2de08bcd56fc431e74ba393f570f130
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest it is designed to exploit PDF vulnerabilities or trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pjzhengwang.com/upload/file/20210913_164218_148.pdf In PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/18919105156.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/12264465559.pdfIn PDF document text
    • https://hsse.cl/files/kovunijagomamibi.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/7876784869.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nuboxifer.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614571f58fb2d---27323069825.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed505af15f---muzovas.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/5379045035.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/78940239088.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/34469525746.pdfIn PDF document text
    • http://lejonhund.com/upload/xigexonikidir.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/tomuxupakurub.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/paduzafowoboxilisoje.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/67919430633.pdfIn PDF document text
    • http://4yoga.by/pics/files/komefofebudas.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/19417124096.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/guwure.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/73846816371.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/67408605544.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/728857010.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/7479025727.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/72363146411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=slope+unblocked+game+gacha+lifePDF 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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 11108 bytes
SHA-256: b3552c09e842aa333a02d1d337bdf4202e2858748947a01db443613e3077390b
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16808 bytes
SHA-256: 09f0bd665c2dfd9a5cd2106e65287fdba0e46427970b25814c5b08e53ee4dfb5