Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4808a926b8393b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41089c82bdb7326bef830b447c758ae6 SHA-1: 4aba4434b4ed02e3458eee6a1b80043874161ac9 SHA-256: 9e4808a926b8393bb63d47411649b509dd37c2e38857bd438473f81be275f8a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links, likely leading to phishing sites or further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/kuxejizakekumewiji.pdf In PDF document text
    • https://acrgroup.nl/userfiles/file/10244672230.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/22537421203.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/semuwozofapafesisuw.pdfIn PDF document text
    • https://kopari.hu/files/file/nowerejiximozato.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/8981c095a2008dd64085dfa51a548db2.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/pibiboparodi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bejedilovonexabofaf.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/wagubanajoraveno.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/51647150679.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/murigol.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/21288933878.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/98212970738.pdfIn PDF document text
    • https://stormester.no/files/file/46171466637.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/7064208847.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bee81eca9---jutubipulofufuwuxedaman.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zevubiwilifi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kakodupemubaruzona.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/balepenitujelogepulag.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigotikujetafusedemi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b80765da---wewom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+1+temple+runPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/68691859840.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_off0000bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 17008 bytes
SHA-256: ce4bfe25661a1dd1d65f8511346f70c7a25876ea62dd2523d778b68b9b0a032f
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 10356 bytes
SHA-256: 8da021c9db6c88ec12aea49c01fe786f40d7ad49bc7c93918bd4b9fe9ea58e59