Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9998cc42ae3a3e4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 16:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36635cc56df7d692e2cceac15aefd6f3 SHA-1: 56f7dc1c76292226a5efcdb64098076068d20ce1 SHA-256: e9998cc42ae3a3e457c79a3760bb6e481b2d592b465c333f43edf32a6caec297
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, many pointing to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format suggests potential for exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://studiobaldizzone.com/userfiles/files/surovozenisipugulu.pdf In PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/83683983153.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xelog.pdfIn PDF document text
    • http://generoussecurity.com/uploads/susizebefalakutoj.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zerenubezirisozaj.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kemimubevopixagaxinabupoj.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/42680985399.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867abe4afd---69599461080.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gogig.pdfIn PDF document text
    • http://sunway.me/uploads/file/101112083221.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/rifimepojuveze.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/79955976374.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/95867166370.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/37965005927.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/99202258822.pdfIn PDF document text
    • http://prmakeup.com/Image/files/vavexew.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/zowalabamexonadow.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/nitudemosekepojowifuxaxer.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/rebagesavov.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/tuvefupis.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bad9cb7c5b3537e4e1a1f8224022c536/33407298164.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/pisigumuvufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=csr+classics+mod+apkPDF 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_off0000b569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB569 19532 bytes
SHA-256: d8e92189b3891ea0d45ae482750695516d4f2e09a2d45cfc453b7bd12ed4a9a1
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10464 bytes
SHA-256: 74f5002039afe3060bc6322a2bcc54ace4a42421c0f12f0bd0b61d5b1fa84466

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