Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db317736e54c6f7…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 15:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e392388d488aed2d3de3bf3421ce662b SHA-1: d07fe21547636df061f1b341e71af6b4a0bf8e3f SHA-256: 7db317736e54c6f7f1ae788b9595c714fdb71b1ba742e5c0fc2032d22b8ffeb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=red+dead+undead+nightmare+cheats+ps4 PDF link annotation
    • http://kyea.org/imageuploads/zuwuz.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/sanupilasobulowalad.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/fibowujibonoki.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/sumumazodu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27402784545.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799024a132---13847081317.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/vafiri.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/91339588638.pdfIn PDF document text
    • https://tomas-music.com/contents/files/pemiwu.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/31643931686.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/fasin.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/xoxisut.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zugemakoxaxixuxi.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/82804774050.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/tinikapewerarokuzirotuni.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/wazewipufur.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/24565851337.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.pdfIn PDF document text
    • http://wernitznigg.at/files/xigatusaberaxadeb.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/45306721900.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210908001207.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/ribokesalipaxapiwisifa.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/46324601872.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6172455665.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8c91sgqub6b3o00hf8gfjjqbms/lidowixek.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/belebixosotaje.pdfIn PDF document text
    • 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_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 17620 bytes
SHA-256: 0bc37f67844483185aceb4ac976ebcd5ffaa9a65d71fa55b6959b70dd586461f
font_01_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 11020 bytes
SHA-256: 60c30d00c41dc1862705ed4e6f1d43af2a6e8a3f388d278e46e07799dd4de185
font_02_sfnt_off00013d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1