Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc3d82addb19527…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 08:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44e007e9f90404adfeedf9bf21c423f2 SHA-1: 36e4a4af2b749018d87ce043fb0cd6f29ac1b3d3 SHA-256: 7cc3d82addb19527e9f9314d75261f843e77770c216373cee77a50177ef52cc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to distinct hosts, suggests a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kohphanganhotelandtour.com/userfiles/file/dabazugilarokoxafusubufe.pdf In PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/19686237426.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437bb9be38---povakamonugilawutuvuri.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/92521460454.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/63827797919.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/gupode.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/duwuwulexozabegu.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/luted.pdfIn PDF document text
    • http://jadeite.ru/images/file/87519944098.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/94921145538.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/pejigewobogipaxawerawite.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zozotopekidavimegilarubuz.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/46937069978.pdfIn PDF document text
    • http://nscenter.cn/upload/files/15938481029.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/fesofuw.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/72420108737.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/senex.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/12867072202.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a2e2q1e70a4licfjeuh0riaa2e/48686365428.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/81433133976.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/fewinivinukunazopuj.pdfIn PDF document text
    • http://schturman.ru/files/files/53461174270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tubemate+all+downloadPDF 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_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 17676 bytes
SHA-256: 2a42455e6bab8c75b33bc10d2718ff67514cacb0b3b65a5301f4dbfdc36d39ba
font_01_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10340 bytes
SHA-256: 3b287a136e04a666020410b85ae87c25246321ec239dc459f25a7491c602c925
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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