Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eab2f107fb0aa4f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 02:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3926aaa36a64653e117a78fa6436ac9b SHA-1: 46f2b9b49e19faeec5002de45df8cb28c1770851 SHA-256: 0eab2f107fb0aa4f66bff7c0aa6fb803ed02c558d74ba168abfb3210e7285f91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://fototipia.hu/files/files/kavalukibat.pdf In PDF document text
    • http://marklaliberte.com/fckupload/file/52184322233.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/99105578464.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/neroponeja.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/fogevalima.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5c59811f---zewolibesebizorekirebafum.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3kbjgv1h9s5ta38ds2ieo78foo/nilakeraxitogewe.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/16508547127.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/tawurizabuwizirob.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/mabiz.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/28806951348.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/66873736998.pdfIn PDF document text
    • https://arerp.kr/data/file///xusiv.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/18557397218.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210911082132.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kagupevexujir.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/57895600506.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/39046956077.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/50425077459.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/zepalowawuwujomusi.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/86733732396.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/34580485418.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/tebirajit.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/lilibut.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/woriwuvakelesesovo.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/xovadepuxotinowofuvoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+ndk+buildPDF 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_off0000b756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 10160 bytes
SHA-256: 2b4663aa9e6eefaa01adc009eced4fc069fa9254c5ea34ce8d04ea13f72146b9
font_02_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 16244 bytes
SHA-256: acb5bf24b91e7b118d31c3e3b19226c45443d84fdb82efc569dec0816590a4d4