Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dec03ef82782efc…

MALICIOUS

PDF

79.0 KB Created: 2021-10-02 15:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 023421d85ff464b065c0ddbdbb7ede41 SHA-1: d8329f38b902aa9ebe4c02d3a003a94b01382374 SHA-256: 1dec03ef82782efcee9fe05eb7ecaf9078f46fe736f6a77ee43306715e50db9b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous external URIs, many of which are embedded within the document and point to disposable hosting, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. No scripts were extracted, but the presence of multiple malicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=nintendo+switch+emulator+apk+download+android PDF link annotation
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/wepazalavoturanuzikoxivo.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82920277937.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/tovisusutetuvezufunolunin.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/rokemipuroza.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/74270517514.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/37189840406.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144e460cb41e---47250796186.pdfIn PDF document text
    • http://bienbao.org/uploads/files/62783162123.pdfIn PDF document text
    • http://www.socfertenviron.org/cmsfile/contentfiles/21703977571.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/41835742888.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/lebefubo.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/21884391324.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/1182326705.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/vatibuviv.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/38167361561.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/rilewovefuzakip.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/94501863692.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/belubazusadi.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/pumaliloxa.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/purukilezolovudagumo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/fosiruvafugapap.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/73804641687.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090412205972.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/39831483893.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_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 11036 bytes
SHA-256: 038010d55caf46b341bbcbf2854219424083df396f6b2a275e4d8de524e9950f
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 21156 bytes
SHA-256: 8dd199a56b5145b8bb591860faac8f73c84b2163b1d9e299bfce4ad2c233fac9

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