Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad31d2a8abc2dfe…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 07:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89100b28d242434f56cd8cbe71098f10 SHA-1: a4102de9a55e26f16a69e2d5d298b47078ee8689 SHA-256: aad31d2a8abc2dfe9a35ccddb9cc43e42f1f9d8df3f828eb24c02fc09a13711e
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm on disposable hosting, coupled with numerous unknown URLs, suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://pnlestari.com/visitbali/image/files/rupugakikolemagixupemer.pdf In PDF document text
    • https://feldmann.pl/userfiles/file/bifikorusuvatigu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/18700071881.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/17265076506.pdfIn PDF document text
    • https://gencatakan.com/upload/file/dalubob.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/pamajabibujurexukarezab.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/senagikuko.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/fosemizer.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/junasojoxalasolivelez.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/1a50c8797578571c058dc1d20a710f74/32213240943.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/24839347930.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/fozitifuxosifoluj.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/42900951946.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/guvopoxitalugomorof.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/6344508920.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/2202666457.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bb7cc27---79318912727.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a47ec158---nukaxegof.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090300424873499.pdfIn PDF document text
    • http://electric-kernbichler.at/66584624603.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/28611997496.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/95208750848.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/zovebilirufomuxem.pdfIn PDF document text
    • http://minhanh.com/files/88911923219.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/84011933182.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/66746954341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=moving+apps+on+android+phonePDF 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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 10584 bytes
SHA-256: 9a6176d3f9eac10e8d729341a40f954c305674aab7f4d55dd31f76d36d13b658
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 17844 bytes
SHA-256: f1f039e2557c16210abacebdb95d205ff665410da8d3a3ff6901a8cf3fc1d13d