Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c092206ff28cef3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 02:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd4dd9954c3c4c5cdb0615043280daaf SHA-1: f7be76e8956fa48313598754145e58658debc07b SHA-256: 2c092206ff28cef38f45f7a1fc57239d2aded270c11b91946158af5c14dfe072
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yomadesign.com/userfiles/Proj_Name/files/kapovibutu.pdf In PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/76880116383.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/piterotabukugojix.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/3867241591.pdfIn PDF document text
    • http://csigikes.hu/admin/fck_upload/file/40910732281.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/87282154072.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/wukusutimowaji.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/tanabepol.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109191758043779.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/37075135569.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/82731711116.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/xapatet.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/jatekikavekijuleboverido.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/puzelixavew.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/gesalaresujipuwof.pdfIn PDF document text
    • https://alev.az/userfiles/file/17827365787.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v0hia9895rno83qou6l3t3mgt2/sepenonesisusamaxiton.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/fijina.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/20056181565.pdfIn PDF document text
    • https://ijpdua.com/contents/files/zawirokusog.pdfIn PDF document text
    • http://beiks.info/public/file/56106822194.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b8836dce94d35b9952e4b70eec74925c/48291799535.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/jusobapolazunebewasizaga.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/36381520726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=my+play+store+has+stopped+workingPDF 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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 10956 bytes
SHA-256: f06b5fda87111ca15308162c64d7609f99503c7a60a5f6469c6bb3c22ba9df1c
font_01_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 18304 bytes
SHA-256: a77f41f417d9ec4ad578741b19845a4f8ba35b6760dadd218151b77a8eb7203a
font_02_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1