Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f996b6ae4ec075f…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 09:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8c5f098f448ccbeaace927749f654e6 SHA-1: a4c07c86ccf91564c35a6c856bc23bff54f3f2de SHA-256: 6f996b6ae4ec075f5e1b046456426405a9d888b2e9080b44daa4a12dc5fcbe81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically advertising a "clash of clans generator hack". This heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic indicate the document's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=clash+of+clans+generator+hack PDF link annotation
    • http://oletrans.sk/editor_uploads/files/50721599693.pdfIn PDF document text
    • http://chinalabware.net/d/files/susoladubofisi.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/26172139798.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/15565718380.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bopavesozulabunigas.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a0d28e01---56954733761.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/93399866895.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210913194447_mad68p.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/67586894444.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/602197783.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/11711440073.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/puwiwidozodereduxikov.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/18067771175.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/04083f2440465454367c14c110c56abd/93641049094.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/monofibefasefin.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vosideru.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10052690457.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/92296459559.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/7748390141.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/19938434146.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/posukopufamitipilize.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/36125429636.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/pamopajilul.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/kalukinusegizoxupiz.pdfIn PDF document text
    • https://birotex.rs/images/files/wusedidokoduxa.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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 17812 bytes
SHA-256: e7c2afca7ce50ab0c7f6a71fff6ecf782b0b628d96c9233eebdafccb9ec5930f
font_01_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 10648 bytes
SHA-256: dbdcc403c777bd6e8e5547c07f4d87f07652ee55a5aa1e82b68972a0647a0f62