Malicious PDF — malware analysis report

Static analysis result for SHA-256 e574afd8c3d424a1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 21:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5acc9be4a9b2bc55f1d16977e5fd09f3 SHA-1: 43d67d4eaefa8a1544e6b0a29bf3107ea888fb16 SHA-256: e574afd8c3d424a1eaf644c30db4e14ab6f4ba76ddafcca3989015c3adcaf15b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting further malicious content. Heuristics indicate this PDF is a link farm designed to trick users into downloading additional files, as evidenced by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_DOWNLOAD_BUTTON' firings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=finding+dory+gomovies PDF link annotation
    • http://nextgenship.net/upload/file/20210902163054888555.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nowowu.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pofifovitoz.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/61488285543.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/87226156525.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901231306_wmyn2c.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guwupubidema.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/kovuvij.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/1458840753.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a14b1da9a---69895911455.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dofavipatavu.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/31664747401.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/68246959043.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/jokipifasegon.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/dulafaminujunita.pdfIn PDF document text
    • https://designclarf.it/file/gulifivege.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/64289665416.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/piputofuzupe.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/75416109147.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905164852191107.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/3846387030.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161469811f21c7---monakibug.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22685394867.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wowamufele.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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 18272 bytes
SHA-256: c62285fc3e53e9ce53ba2e1f4929f33d809f276bbfca8b932528e878ba102db5
font_01_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 10444 bytes
SHA-256: fbe0eb7d47ce0d91c28b05165131b9905ed534a61c04cccef580f8fc08771196