Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03caab2eeeea234…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf06570de604d4a377206f05e2595454 SHA-1: cf0fe038786bf8583dd5a8e7f5cf640d2b57b026 SHA-256: a03caab2eeeea234eea0a95a810e206da217b0b8d4fe91a9e7a6fc46995cbc83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious PDF files. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 http://smolninskayahotel.com/userfiles/file/rimozarig.pdf In PDF document text
    • http://tw-jia.com/uploads/files/202109121028545021.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17330471952.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/89183500667.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44236920278.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/48653694487.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/14005970374.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090704105428.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/60603008690.pdfIn PDF document text
    • http://trieuduong.com/images/Download/rulaludenizubalu.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/24532857680.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99fd4dfe003918aad9ee46bda765a8e2/vuwinitanozodozu.pdfIn PDF document text
    • http://orlickachata.cz/files/files/35654517987.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/5803025472.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/50730901754.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161322d6482429---timaxafasanokikar.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/21109342031.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/3beadfab00c6088b14f026921d4b82f7/gateferosepet.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/vanuve.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/27317240652.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/41073101358.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/51158959035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=iphone+cheapest+price+in+which+countryPDF 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_off0000ba5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 10676 bytes
SHA-256: 2653e9d50f3dee7f9cb0793ee3bb844fe6fd3d1f10f218d1c78653d7c2f4abe7
font_02_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 16700 bytes
SHA-256: c5ff27b0e3961a710e93216e8fd5ad989876404c2e1c0df9961d15623ddc7438

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