Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22a47fac266f245…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 14:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9f24c00a910a1e4227df56569757d19 SHA-1: 1254cdee5f76b695c9d763551481c91e36364ace SHA-256: a22a47fac266f245ebf2ba51210f4b898a5bc477f452a7545e4afce0a8e8d4de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=bloxburg+house+mountain PDF link annotation
    • http://babyshelter.net/assets/upload/files/wosusidolebagolapatud.pdfIn PDF document text
    • https://austarpharma.com/upload/files/82517575230.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/7212331261.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210905091251.pdfIn PDF document text
    • http://www.toptehnik.si/images/83995702600.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/wimodufufoj.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/mojowaxus.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/96006282851.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/20254113149.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/badukoxovilu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kenafapilanu.pdfIn PDF document text
    • http://spakimthi.com/upload/files/bamebogawadejobive.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/84307212381.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/4838dee57557bdade27f37cee692bd18/meludezoviwiligujobipe.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/befugukajorobagar.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/guduriw.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/4859787362.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/22370853765.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/96443269099.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/nexibazun.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buginak.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c859c798f---26933147043.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/52218822081.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_off0000bea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA0 10952 bytes
SHA-256: 9267d45d4ed2c1e105cfffbd82c9ca85edb6b8f5953fc69eab075e8ad2679959
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 17744 bytes
SHA-256: 77e27e62637d00b5ea0ee6c614b3f959ac07488cd16aa58a2be238e15d80e426

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