Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce96ff2790086750…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 15:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b739086c2a80f626978cef306ab63c5 SHA-1: 79d38be1d6cced8813ab9cb33407b42a5c60d256 SHA-256: ce96ff2790086750d726c9619328b0a1a5f025ccabf77144d3f212718bc5295b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pistant.ru/uplcv?utm_term=mi+call+screen+app+download PDF link annotation
    • https://ls-machinery.com/uploadpic/files/202109080628581798.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/31837349645.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/bugasakigorofelikewuda.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/51710408426.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60167835625.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fumojonanizowakimiwe.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/21671539448.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/56352613081.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/66537712403.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/35731502509.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nowuj.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/taborefukazuzegufopijiz.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/91228553749.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/gogodarirujafelukit.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16483332703.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/61774487498.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/salawigilejefakuwezas.pdfIn PDF document text
    • https://digireg.cz/upload/roxexozo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0490ee70---32831799682.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/46446615887.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/33804898358.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/2108065281.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/dibagugij.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/zijuvu.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/vaterepusudosijomebiwox.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/wopujijugivofutuv.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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 18536 bytes
SHA-256: d30b9b1ce8d8b1223eb10eb62b2c1be88a4e69b6a43a55e6efe5fbe4cc064d1e
font_01_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 10488 bytes
SHA-256: 7ba6fc819309b838a6e1b0daccbbaa683ed16423979b0ac184b92af8d9aea5d9
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1