Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9bd06c3560564d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 20:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 287d62fa98861b53381ecf20a4d54224 SHA-1: 138a90915d53436866e2080f5861a2abbec0d5df SHA-256: 8b9bd06c3560564d4604d193d835b3530c29a4a418f790d69dc099390dbaeb87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the true destination. The ML classifier also strongly indicated maliciousness. The presence of these indicators suggests the document is designed to deceive users into downloading a malicious payload, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://reazfarah.com/ckfinder/userfiles/files/nuwapadisoxobiketikubi.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/49321613160.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/kusep.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/39568005179.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/93272132170.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/lobesugipisakapuguso.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30a49f09c---luwolelamelukunibapura.pdfIn PDF document text
    • http://groupkaishan.com/d/files/kosugerumurewegij.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/jonamexigeri.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/varivozadepa.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tapuzodurof.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/59528465388.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/soxonodetemoxupin.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26547046641.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090701243373499.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/15119724826.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/jexugenitavoxisafa.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/31131208177.pdfIn PDF document text
    • http://innotack.com/userfiles/files/95799938778.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/57744822343.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/67105916011.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kupemukodimu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/baramasod.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210909081852.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/zuseminepexajebubeli.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9e00e2feadeab548c8887278c6f8f88d/dabifebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vlc+player+apk+download+for+windows+10PDF 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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 10952 bytes
SHA-256: b4f9ae8a09294bb81fb51dbc23d928c587000b32ab78bd12ef7c703efc949888
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16720 bytes
SHA-256: 0bd184f6a27265695d73da42461fc2bd12d58d8b4482b497ffe6201566465bb1