Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eea01b9fd64d766…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 08:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17b57037fc0c893be8e7d18ab5bd615c SHA-1: dc1a99e8e15c7feb06e1ebdf606454781da065c4 SHA-256: 9eea01b9fd64d766da2b75679f1e9f21088e577be95566f107ae865fcd582108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The presence of numerous unknown URLs suggests a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://hotnewsmd.deca.md/upload/userfiles/files/wuzurefuduwuxob.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/jozidavumiregolokudavetu.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/13140015180.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/timixuwixuleboto.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vuzozisokefo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/69959570219.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/kewer.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/38956224804.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb72990d1---feboxevinut.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/rovikuxu.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/jagatev.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/zuvibupirinebi.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/71944268971.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/39062490488.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///20219262330204060.pdfIn PDF document text
    • https://bagstyle.uz/images/file/12833339295.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109221410201303.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b27606aa1---navazisuwabanemodenipibol.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210918_58BD6DF06ABCBC3B.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///xatevapexutaz.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/52628857234.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/31793502067.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/lebuxofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+file+browser+for+android+tvPDF 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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 10692 bytes
SHA-256: 36a5231c2ca0e124cb97c69528a1380fbfd90db61ddb3c0b66462c35cbcba8f7
font_01_sfnt_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 17888 bytes
SHA-256: 2c49b631e2e48d6119a83b47d5dfc7d61c141686979da1bfce2f5c6a8d2c8542