Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecafaf0014307f5b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 05:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1c4678ba761f9fd5af2e658cb7ecae1f SHA-1: bc81423c32882ed1ce475072e47a97fb8d3957ad SHA-256: ecafaf0014307f5b78b7c2e01b95c906c024c63cd1fc70474035ba78a52a5def
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common tactic to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://crysiq.ru/uplcv?utm_term=android+game+sprites PDF link annotation
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/manidoxovaw.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/85084602837.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/79250319270.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/44246613604.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/kogemolutopizifofiwedusib.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/89541094695.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/taguruwokatofemivakarugat.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/dokiwiz.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/91199358658.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/66451944198.pdfIn PDF document text
    • https://csn-alliance.com/data/files/34842600915.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/funukowab.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/bojipuvew.pdfIn PDF document text
    • http://fohow77.ru/upload/file/72077552074.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e785cad89b---janisusali.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jiwugagufitagog.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/sewinejilujemejimuze.pdfIn PDF document text
    • http://www.ezmoving.com/file/nepifomiverutumezujemebud.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4d8d047c---74493310485.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/rusivevawoxejukiwerenogo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/zinibivogojapelosisera.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/14698525523.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/xibenipumizunemegamiz.pdfIn PDF document text
    • https://trexanh.net/upload/files/jokibelozujenazupotukolux.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/viwojomelopir.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/nofadaka.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_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 17332 bytes
SHA-256: db2e27d9ecc9aac91210955c3df7d12ebecf3a1bf311bc64fa2f1598b304a715
font_02_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10668 bytes
SHA-256: 32e8b20b925d793de5442833f36eb5d470d1a9d801493ff106de5d168f839893