Malicious PDF — malware analysis report

Static analysis result for SHA-256 8388d6a20aefaf65…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 14:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 095ff4a15bdfe60636532b20347a6d42 SHA-1: 5cc2f68534b74c70c1479648b1f4208a6ce392bc SHA-256: 8388d6a20aefaf65f2c0300469518cbf126a507d1bfd2203f7b0438b865ead9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially suspicious domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://qkon.ca/images/file/pupabimetudijujupaw.pdf In PDF document text
    • http://dmkaudit.sk/101/upload/file/49162917337.pdfIn PDF document text
    • http://uco-kampen.com/media/files/74691902265.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/13527892318.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/81262697091.pdfIn PDF document text
    • https://redac.ch/upload/muwamubijupuxipax.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/ruwifula.pdfIn PDF document text
    • http://villkasz.hu/editor_up/84141650599.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/24910115979.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/taxudepamaravemolepabun.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/sovip.pdfIn PDF document text
    • https://amgaa.org/temp/files/rikemaket.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/vigugisaro.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/jozipimogukoroputivonipa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a043bd68---18906357124.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fakenujarixu.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/guwatirupinevorozapegibob.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/91721552887.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/9798803448.pdfIn PDF document text
    • https://bdata.vn/upload/files/12972676222.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/povogepiwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wonder+woman+torrentPDF link annotation
    • 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_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 10184 bytes
SHA-256: aa5ac56799ff0094bbdb1b8dac208115072d1203c66b8dcd1d25496013eda4d4
font_01_sfnt_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 16268 bytes
SHA-256: 64a26297212bf05ac239674e7e2e4e5d33c326c3bbe32146396723e084879a27
font_02_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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