Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64d1f2df09e853c…

MALICIOUS

PDF

99.1 KB Created: 2021-09-24 07:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6358bc28606272eee8c95797a6392b99 SHA-1: 6d9ca1373c146eadd9b93f8d1c302b6bcea103cf SHA-256: b64d1f2df09e853c5a7bddc32b280734d5bbb5a15c5c74acad6c3625c2a363a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=watch+new+release+movies+online+free+without+signing+up+123movies PDF link annotation
    • https://castel.ro/userfiles/file/26346073261.pdfIn PDF document text
    • http://citra.cl/userfiles/file/14996947336.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/3390209637.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fe7kh6c6qam1536pd6btfptm37/78990757351.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/mepupinimiba.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zuvagenasuwuzesawanujax.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/xonub.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd0729476---76892703838.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/57577244345.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/zoluwuxadine.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/27063222073.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/tatoxinesa.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/73885363760.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/67304422528.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/fabutivefiwikokari.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/devupanubunipe.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/fukutedogidomejupizubijaw.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/86610017479.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/62177119235.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/pukofigekisuvokup.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/penabisetonuzep.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gironizozesote.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/92633284902.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/zajegaguvatuxukulojasaj.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109070627185180.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_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 11516 bytes
SHA-256: df35fbc7267ab560b4492ded5beab0992f354afd7bc775800c3787150fb0ceb5
font_01_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 19724 bytes
SHA-256: 666ea9c33ea32c582d5567d0d341efea4cd9f99c8d3e0dd65407e0f9d8c5194d