Malicious PDF — malware analysis report

Static analysis result for SHA-256 5884ccab3800b90f…

MALICIOUS

PDF

80.9 KB Created: 2021-10-15 08:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 45cac260f1cdce589b64efc5dacddddf SHA-1: 2fdf1ac455c8d7b7ec3af70a85a00fe710236c54 SHA-256: 5884ccab3800b90f0276c5dfed11bc72bb23c899dd319a05f65c1c13052b5315
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host many links on disposable domains, likely to distribute malware or conduct phishing. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://uniontsg96.ru/admin/ckfinder/userfiles/files/35221980465.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/fugufovid.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zodav.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/54529396668.pdfIn PDF document text
    • http://mextro.de/upload/files/malebine.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/91687613698.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630766731.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/32396729229.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161607fd450631---nagubejarujabumoguwuv.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/mekeriteziv.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zukoduzezev.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/narugigafanef.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/buvimalasi.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/89682282521.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/bawovaxuxufem.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/minefoxejofavifusukavujep.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210909_154618_183.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161590916b1d6e---75460959897.pdfIn PDF document text
    • https://partetesal.ir/data/file/45870260141.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/66395973449.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/nufalo.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210925000118.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/xomixerogad.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/71000087373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/Z3ufxtS7Wvw/uplcv?utm_term=is+an+unfertilized+egg+alivePDF 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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 18352 bytes
SHA-256: aebc848a2892b89e14d8f31ded3db53074b71b49c7ddc57d139dc1fd0daa4f60
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 10584 bytes
SHA-256: a9ffac3099868e16f412aff6498ee48aa55574d804e25179fab52557df40f85d