Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9e8d459bb63556…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 22:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f6bb389fa39e8f898743f422caa856f SHA-1: 46f2ed1fdf6ef08427a9a86b2dcfbc36c152cce8 SHA-256: 9e9e8d459bb63556d68ce7485f85ecf4770a64032fbde665d00ae944d28514f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=autocad+keygen+2016 PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/34a8cd9a8d4630123abedc5b86f55acb/jejonozukisenopu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/zoxozezukozuwugodoz.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/78428543908.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kimusurotoxodi.pdfIn PDF document text
    • http://skomi.ru/img/files/file/sozomubojotijikof.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xosonem.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/67149475882.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/10177600998.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/50765527014.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xusofejapafebezefa.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/53037517278.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/19138435796.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/35468214736.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/gobebu.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/77527211105.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/rikulalajesi.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/25605208851.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0416933001630976208.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/jazabujidokawifa.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84949783541.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/butisa.pdfIn PDF document text
    • http://trubaopt.ru/content/file/95490631348.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/laxameropekegilolulew.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613142772d96f---mosewumesoxe.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40642462174.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pizasupivogelojew.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10888 bytes
SHA-256: e5a9af959f43b45f00dc3c02155696faf0523466f6c04e024d118983a98d2437
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 20460 bytes
SHA-256: 603926fb16168333c02a59ffb35f886ada681ad496807dd6fa31a5c5f0272c59