Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec557be4baeb9da…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 06:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd47e18c2b959efec2315eed8306fbe7 SHA-1: 99be238f75a8e6059087c6d879b4bf4aad4402e7 SHA-256: 9ec557be4baeb9dae4c6de7e807cd0c2f61533e3ddf70ad9e220898189c105de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=first+aid+for+usmle+step+1+2020+pdf PDF link annotation
    • http://guidesdugrandlarge.fr/images/import/file/4062806941.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/19507591841.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/78184549371.pdfIn PDF document text
    • http://fabtur.ru/upload/files/lidosi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/nasoliw.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/3035818620.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613826be0ba1d---kumorufowed.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/xowaxafomipagukid.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/kuwug.pdfIn PDF document text
    • http://tabletopad.com/images/file/guzenisofumamorulajuv.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/73099135204.pdfIn PDF document text
    • http://grandfiltr.com/files/file/joxopiralanonulozutaw.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/11284590321.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/kinumemadakifos.pdfIn PDF document text
    • http://storemisr.com/uploads/files/51747845174.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/94092845110.pdfIn PDF document text
    • http://industrialdevices.in/uploads/72189132375.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17030996021.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/xegapujovupomixi.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dimolu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137b56e6a778---tufoker.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/46544580832.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909081324413020.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_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 18984 bytes
SHA-256: 0323e81ad9172684399904aa2f5868f8e7a82389fe7eb06fc1a1d04af680c25b
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10924 bytes
SHA-256: fe7958f3b98948c49deda816ab9c02e7cb46c47a2cc23ad9b70961923327ceff
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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