Malicious PDF — malware analysis report

Static analysis result for SHA-256 e450d62542c364e4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 09:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65ccdb880b7db2af6318cf7ce9fe0b30 SHA-1: f14031a48285e461f8f0f8067ab53e8e8714bd29 SHA-256: e450d62542c364e4da545172f0cc612213af7c3e7441c926f6fe9317a36d2146
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://akanaymatbaa.com/calisma2/files/uploads/gawutedixevepaminuke.pdf In PDF document text
    • https://milosislandrooms.gr/userfiles/file/nujibanurexavovoduzo.pdfIn PDF document text
    • http://foxadv.net/file/musax.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/logujodudixejufe.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/nefafilekewexapofo.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/mijekatufolepide.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fezuwivugofi.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109050436223991.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/xipubonobalofedib.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/17400507707.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/84000921863.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/69629369249.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///fakapo.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/lonit.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/65322601845.pdfIn PDF document text
    • http://hotechike.com/files/files/tigove.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/98942112670.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/limifos.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/41496408069.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25705308819.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/42029581093.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/gevodex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solutions+intermediate+student%27s+book+3rd+edition+key+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_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16796 bytes
SHA-256: 4470ecff01b2697daf670a8a626227a25b14489f4603ec1a30e0a398cb4ec1f2
font_02_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 11388 bytes
SHA-256: 472cbcd069cf972f3380618b7170375eef51020769455187280068f18b8f1b8e

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