Malicious PDF — malware analysis report

Static analysis result for SHA-256 479117e4edd1821f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 14:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b2a750d5aa3de3bd0b46a67bdbd4ef9 SHA-1: fffcca5bd54029d5b6ae454b2c5451825c1d92e2 SHA-256: 479117e4edd1821f06d1cc83a185c94d98fc1214e76adceba01e5e71b24c370b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, which are likely intended to lure users into downloading applications, possibly from fake Play Store links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://graficaeformazione.it/userfiles/file/10198214085.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dedfdfb98---rumejenale.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/54768707950.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/68509909015.pdfIn PDF document text
    • http://cakkue.com/contents/files/xokolupatukowijegeweguri.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/28152162683.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/16525954038.pdfIn PDF document text
    • https://maria-galland.ru/files/file/kanibenedavomenod.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gonaxap.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44875364532.pdfIn PDF document text
    • http://muszempilla.com/files/file/73381972202.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bbba2817bd457984d96902bc8383d475/48233324581.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kivadepira.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/mobexesitudujirodog.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/potanijudabifiled.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/sizaxujiboputebowuf.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/35223037757.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/70363733980.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/86176920124.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/punuxusonugugan.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/71586059851.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/19707747808.pdfIn PDF document text
    • https://adikkedua.com/contents/files/39377427797.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/libawunozabudamepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+play+store+apk+appPDF 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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 10588 bytes
SHA-256: 8cca6969a446806c21984933b307d7d9cf51acfdc688eea6d2a5549100f0976a
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 15952 bytes
SHA-256: 2cdd131330488ad727af8998dd64cab65b4142dda60995ca5a36f6f2950adeaa

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