Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eea2cd961fc2370…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 00:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3311e374cffdb83556ec0701923500e6 SHA-1: 7f787c24969cf1b7bd4f281a0d4ea3f2b8f4b797 SHA-256: 9eea2cd961fc23707eee9e8800d2c87369dda0cbed9569bdd70ff12338a40ac2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct, potentially disposable hosts to host PDF files, which is a common tactic for distributing malicious content or redirecting users to phishing sites. No scripts were extracted, but the presence of many external URIs suggests the primary malicious function is to redirect the user to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://phuketdriveschool.com/userfiles/file/131396032.pdf In PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/62733846816.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/77282298007.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/joxabagarudagowobubeb.pdfIn PDF document text
    • http://acelybio.com/upload/files/50804131163.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/4863463585.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/wexeguninutaluvevuraval.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///baxatoxetikixajuxupow.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/76597804820.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dapaj.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/siguwegejajoxir.pdfIn PDF document text
    • http://qzgj.cn/upload/file/mikobene.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/xubabelevabixemojikimu.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/19357783540.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/81086678258.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/mawarofetum.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/30540463512.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/88921360028.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139249f9568d---sirekolonisibobujakupedam.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/49477809718.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/nisaren.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd9505c50---26409576255.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/96583162527.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109041111572733.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/88760898512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mit+android+auf+netzwerkdrucker+druckenPDF 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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 19168 bytes
SHA-256: d9b756d7688f90693c6e6dc3285a9e1ba748fb3a7afd6ace6b7a292046b758ac
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 10584 bytes
SHA-256: eb754796136056d18de0ad27c619c061fd27517205516ca9c43d50781f1bb010