Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00dc7d60850ead2…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 13:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b36add649b5c0672374a9af6a79517a8 SHA-1: 76c8db1fb8ed8e6cb1ac5a6f84bdd05f0885f476 SHA-256: d00dc7d60850ead2ff2fe926dc9eda26255bbef9a53b2e2c8869d83c5294c41c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to PDF files on various domains, suggest a link farm or redirection mechanism likely used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/82064182917.pdf In PDF document text
    • http://medob.org/SITE/files/editor/file/nisavoxajelami.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/gibivex.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/zitalefopunelas.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/41715905609.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/26912788568.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/45165808016.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/lemubanuvotime.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/90045899177.pdfIn PDF document text
    • http://sdes.in/uploads/74112976802.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/81158737043.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/76725632639.pdfIn PDF document text
    • https://europartner2.pl/uploads/zasorugikisivogigalitew.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28235868075.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/tukujeluvefibonimeze.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad561e0fc---fufuwinepitipozimajo.pdfIn PDF document text
    • https://petala.gr/userfiles/file/rurunitaratidogebulopojew.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/kuradumo.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/76173481302.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/ronerexebiginepijuzov.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/kazudot.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/lanunewif.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/61164712520.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/relopeveratikufabewa.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zibowugutenefeju.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/20933506821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=video+to+audio+convertor+onlinePDF 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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 16444 bytes
SHA-256: 67ede7aa7cb3b35eefa29ff2d7d4a6668bed872d93775df5697002789f7c9fbc
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10328 bytes
SHA-256: 435bbe9fbdbc7e258476d31aa5594f0a727a383495a3dae871b4977c83b62201
font_02_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1