Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a52a29fac5df2f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 09:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10333a0ec0102932e45e8dcecad2283b SHA-1: a5d0c2ef56daffaa01119b05a99b021ed9a89e45 SHA-256: e3a52a29fac5df2ff87041a0524311030dcf711671a14835c73312af370aef52
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://xn--989ap7r0xbd5x.com/upload/fckeditor/file/22043045483.pdf In PDF document text
    • http://elosc.com/upFile/file///ITX202109100017204637.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/79951492179.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/54713048562.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/wepiwesafodedigib.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feec4d5b4f---14387418826.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/boxifuxodejed.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/gagomudekutaxuban.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/xarugi.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/xagekisozag.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6f299775ed5e75a655e83d6f3b0c26a7/gufalejo.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/35451715156.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/95227597545.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/gadiporozipetaxigeb.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/92517220264.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zemazog.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/89367566951.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/vujuwedolonatowopuput.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/xigodebidojemume.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/80490141302.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/vigiwemodazejomikobotajed.pdfIn PDF document text
    • https://esvigo.com/upload/files/68044248683.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/83978570204.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909041308964186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=top+10+wallpaper+engine+wallpapersPDF 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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 10552 bytes
SHA-256: 68664f44771185131e6da4b3cbb8fabd2d8ae560cc8e3b5e221906f8114e7538
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 18636 bytes
SHA-256: f698e0b861d34edf6a02b48e2b1f0adf584258eb95b90d4b975d0f6f4ef8c3f5
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1