Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbf4f1b1d97bffd…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 05:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 416b14c9bd91e993787e12b8fca33f44 SHA-1: f38d81af2565749f566750c72e6e04ce174cedef SHA-256: acbf4f1b1d97bffd73e1c36d2261fe6f5a931c499e19c5eef106b185a36a1537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious 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 the presence of external links 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 0.9986

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://futurefacesnyc.com/uploads/file/pasofa.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139c695a804b---26914643756.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/vuwumevogubavixof.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/55742549917.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/6994777758.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/88237270493.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/23236903683.pdfIn PDF document text
    • https://proxus.nl/file/81944813386.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409020e909e---80501177520.pdfIn PDF document text
    • https://phuquiland.com/upload/files/67970539979.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/nafoxidixajerugotigipota.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/wusubixigamufixizolelede.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vemisudalezunefujitola.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/zowemapinu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/53690338435.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zexilizuk.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/kizakajekasidamedusame.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/webulewaxasumek.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/fipijudepekururub.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/28250676727.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/47602480814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=two+unbiased+dice+are+thrownPDF 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_off0000b086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB086 16996 bytes
SHA-256: b260ea05c3a4ef468db8b828f58c6b26b67ab738193b01cefc10733428536cea
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10708 bytes
SHA-256: e335db2861d799643a4f4705bcfb9ed7a9fbe94ee26044d5f8b9f3c1d2376bdc

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