Malicious PDF — malware analysis report

Static analysis result for SHA-256 0839c6ca93dfddd3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 14:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3606db19b9a1cdf5699766ad8a58047b SHA-1: 7906b328f997a287c2d514e2bdeeb271a9a9954b SHA-256: 0839c6ca93dfddd3253ea5b9f24ed85f27aadfffaf290d6a4280272b3c4ae943
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The ML classifier strongly indicates malicious intent, and the heuristic firings suggest the document is structured to obscure its true purpose and potentially lead users to malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://elnativocoffee.com/silver/upload/files/zotozelilaguvuvi.pdf In PDF document text
    • https://maviet.vn/upload/files/69676320734.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/vomud.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/47629957121.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/rutosisinominikamon.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/37986543758.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/magarudexuvuladagakumujag.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/50587302643.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/sitirufovenodiwemiranu.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/timono.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109180753284220.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kozagu.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/91757288522.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/romijurusafinowuginitasot.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/27613065128.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/749092849.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/79170262127.pdfIn PDF document text
    • http://iviltra.lt/images/files/jofazaxatumowama.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/76755330551.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/4368404736.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16140f21288b3b---78131333702.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/lenekokof.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/wuzemo.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/64059912239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+shooting+games+for+javaPDF 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 10864 bytes
SHA-256: 1aa0988d8861eecfc2f0466d35c78bceed3a636a07869f445326707fdea849a4
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 18388 bytes
SHA-256: fbb555e6878256ba357c76e45e7c1dcb50c8348b62bdba51062f544c6563eb51