Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef00a17748e903c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 15:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 611bdcfb64f06b71e4be7b8e976b2f4d SHA-1: 1f636aced816a375ce939d5150b4e872b0366f2c SHA-256: 0ef00a17748e903c74793b573c3609cca9f638eae01e755e3a03d65682324e5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting it is designed to redirect users to phishing or malware download sites. The presence of embedded JavaScript points to its use in executing malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=efootball+pes+2020+similar+games PDF link annotation
    • https://renewone.de/files/rogaroxewalebogodas.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/96844772730.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/76540000594.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1286882840.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32f71928c---66140585475.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/55579569275.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/govegazosidovodajirug.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xoxiwinogotiduzasofogame.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/judazal.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/43081380910.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109101410597426.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/gigonixumifotigos.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/79727859287.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/11807136241.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/74897483142.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367e4280043---dajori.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/37599870768.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/80440572996.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/83618025545.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/72764989221.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/sebasuzediluman.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/76303762672.pdfIn PDF document text
    • http://brukbet.com/user_images/file/denomopexujaxa.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/75471471390.pdfIn PDF document text
    • http://hongdacable.com/d/files/xotutewumera.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/63589933583.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/21283601931.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/30770938967.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16896 bytes
SHA-256: f02261e7defa5aa51f3229d5be5431389b84dc790a4cb7486265c39f0c85dbce
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 10964 bytes
SHA-256: ca68622f87391c0c9805ee402e406da0aae3ba9343e5fbf53f02ab9467a07213
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1