Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e8ba2e6a3899ed…

MALICIOUS

PDF

71.8 KB Created: 2021-09-11 16:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f7379e6afbf1d53cbb3fddec536fa49c SHA-1: acb0a057e1f4972a5b5160f75957d5ab364316ee SHA-256: 54e8ba2e6a3899edafabc7d27bcf1169a34eb116fa3758b3062fc86a186098dd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/94829226028.pdf In PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/358071186.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/47950760100.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a1d45597e1aeb6c17c128c59fe3c9fe0/32405331638.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/56482058834.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/riwevivodezumogo.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/86374442621.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31921552943.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/vitivuxafosuvodopaxi.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/xumujitigodobimoxofilere.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/votawa.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/kagulekini.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/fowigidu.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/lukaviz.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/janokasa.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/98101089887.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/roxibime.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907231754239308.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16133d21eef181---9740786502.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/50244399228.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bevixurinupiwolo.pdfIn PDF document text
    • http://sro52.ru/uploads/files/49783959671.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5c2aac67---fitodikar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=microsoft+word+reader+apkPDF 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_off0000b7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E7 16068 bytes
SHA-256: f8fe8942aef0d05ecc95bb0b9c5a91dab106b8a2c9d07753e19abec7b07b4e3d
font_01_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10636 bytes
SHA-256: 2843da6212773dca758978676bd5056c99e2d97d29ea93bad39e39ee6620764e