Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c98ba8a6cc0aa…

MALICIOUS

PDF

80.8 KB Created: 2021-10-14 10:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0839ea8c596a91d43959aa0da7feb4c6 SHA-1: 1e1e65e444472890e64d864ea33f2834ebb782f8 SHA-256: e41c98ba8a6cc0aa7755c8c6938fb5ff9e87b7c1b4580afdfd7379a4ca87b7cc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document's structure and URL patterns are indicative of a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=fifty+shades+of+darker+2017+full+movie+download PDF link annotation
    • http://werder-ritter.de/UserFiles/File/duruxovebujevirikela.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sagunawogabenazotategor.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/88890087879.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/527aab9396e6f600748336edfa74968a/78197749799.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162b6ac2bc47---87109861193.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pujevil.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/56194753410.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/lawetivifavev.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/25206944565.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/87151323864.pdfIn PDF document text
    • http://ermolino.mebel18.com/uploads/files/94550584948.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/45189608153.pdfIn PDF document text
    • http://hun777.hu/_user/file/10313449779.pdfIn PDF document text
    • http://ekonomiyonetimivepazararastirmalarikongresi.reklam.cc/FCKeditor/editor/filemanager/connectors/userfiles/file/35643061838.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/53544101088.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jirid.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/77319881012.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/77954064823.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22417689762.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/6512999242.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/57003595750.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/18466330370.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/18104644340.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/55154756837.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/laxazuloxaserudobi.pdfIn PDF document text
    • http://stattus.com/assets/file/rutemipisunapozufe.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/kotaxinawe.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_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 18444 bytes
SHA-256: 4cd8d8c916f9d5c19860afd03507663ef633ee7da3055aa7acbaaa10fce9d186
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11396 bytes
SHA-256: c284623f9b523bd32de8b92665dfa767bdb870de00d3bf27f289559db06ccb29

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