Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09ab64325155b02…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 20:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14e13179b613825feaa7d15a5aa50487 SHA-1: 16dd85d7712936946c9a76c4cfe090cfa6297be7 SHA-256: c09ab64325155b027735c2c6aefebf320c2382cab44b76e79d227f734f53e5d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links. While no scripts were explicitly extracted, the structure and heuristics suggest a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://vividconcept.in/userfiles/file/jimenajobonidemisixu.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073249be2a---romupigotavil.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/75457001019.pdfIn PDF document text
    • http://ingore.cn/upload/files/8932445647.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/kofulukejaxixoximu.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/10423027733.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/51403290630.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/wupunu.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///85865616935.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/40774884501.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/mitabezifetetil.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/92207827264.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/nifixexilepo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911035755635052.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8bea350e6f7e3760b66625643db34e85/ruramo.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/lawomokafabovozibi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/gigimevorax.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/74411471150.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/26865487825.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/58401885343.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/jupebugopuwenusurorofivum.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/zeduredopipazipeduzir.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/nonofajupumurafusofabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+block+ads+in+android+mobilePDF 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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 17920 bytes
SHA-256: 4a707c4c75c93c9c65174766cdc2e4efc4856950085c5f74f793484afaa9faf8
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 10840 bytes
SHA-256: 9a4e83dc9822c97ba2fa63c3772fd66d6ecef80ec1e36afe7783005a398d55f1

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