Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44e7ad94d35e007…

MALICIOUS

PDF

94.5 KB Created: 2021-09-16 05:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a6792aa98341cd8a682ee25e0915c0e8 SHA-1: f884fa36c8602c1ea4b025a09491ce25be79954d SHA-256: f44e7ad94d35e0070a543d88255122f060e2e484f0d629fa2e4a9ae6ca6ca58e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://santa.sg/images/users/00000000/files/kawosavomemaw.pdf In PDF document text
    • http://ortopediaszombathely.hu/editor_up/82396278422.pdfIn PDF document text
    • http://sjanzee.nl/file/81121489044.pdfIn PDF document text
    • http://fxlcd.com/upload/file/tisegepe.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/tizalilelebonesa.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_223115.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xivifukimijadupo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/30095800431.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/fefazuj.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/63119419914.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/punufasejutixonoso.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/6346886226.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6571cf49e9e08149af0dd08e73b8b3c2/16933187981.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/moxejigunejadoxo.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/133264437.pdfIn PDF document text
    • http://doanandieuduong295doson.vn/namthuan/images/news/files/jerorulupiwapiberux.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/tosorilawusajaraw.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/paganejajibiralidop.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0f373d9e---fativokepukamanatiwapox.pdfIn PDF document text
    • http://clerus.hu/files/file/xupilad.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/97723034320.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/76105451646.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/welufazaxanul.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/88577024803.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/solumumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+book+of+pleasure+pdfPDF 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_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 10596 bytes
SHA-256: 80c69f6aa3398fec48c7d6ca36e1e88fb4787d051bacec3de8b1370ce162c4a7
font_01_sfnt_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 19668 bytes
SHA-256: bfc8ceef1ec644526b61a8fb67812419de620580d230ec8b65ef440ecc94d0c0
font_02_sfnt_off0001542b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1