Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa7a7e21211053…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 12:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11997b71e93053c6f8394e2ad252d99c SHA-1: 996122870d38dae63102281ff39011970ee14843 SHA-256: 66fa7a7e212110538e9d306cd6650990e208ab001a88e523faae3db05c592297
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=app+porn+apk PDF link annotation
    • http://siciny.eu/userfiles/file/43852721898.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/fanunov.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/gagara.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-13-02-04-53-76.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/83988145451.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/26854890306.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pololazozilonibifizun.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/ziribivarepadad.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/jafewoxelorafanemeb.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/likitizorox.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/95858438008.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/56710440648.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jazujizirujopiwatu.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/gapawogowuj.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/kudukove.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/vefakuvupifuv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c871e7021---94415712656.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccc6c7fae---92112092381.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/22731511227.pdfIn PDF document text
    • http://capri.lt/userfiles/files/zelomexekutijotuso.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/24238563506.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/73449183584.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210906_135219_140.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/30239804518.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc1a6096---23170633562.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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 9780 bytes
SHA-256: dc595553dc9472e55e3c2fbc6cef552b4ef8d6c5e799c50bf6407d00f85331b9
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 17864 bytes
SHA-256: 7f4c41f479f496b9b6965a386d44673640c2d6ce87fe27c1fc2c24893bee30bb