Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a8cb074acfeb65…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 17:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 08c1be2c16a02af5482dda6a4847004c SHA-1: 0e8d843017300227533ab8726fa3a6465e7f63f4 SHA-256: 54a8cb074acfeb65062f7d11b0751f568f0ff29281960d6327d4cdfd0c4be864
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed for obfuscation or spamming, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asremajazi.com/uploads/files/26357625847.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/5167143944.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/wesetovonivazub.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/wibojezuruxikubuneg.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/95412824825.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zetekudifo.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/36657193329.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/busajodagazukup.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/zuritexabalisomebewapik.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/11652915458.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/dubusabut.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/galijewolonivopujesina.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/50309017064.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/22312857522.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/begigiwilasuf.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/ramisonatasexurojawire.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/78671819358.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/47951451309.pdfIn PDF document text
    • http://schturman.ru/files/files/7281335823.pdfIn PDF document text
    • https://ms01bet.net/contents/files/tikudi.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/96225217335.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/97944873543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=necronomicon+anunnaki+bible+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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10824 bytes
SHA-256: 799d57f53b2124a7ac447db4b18091bc362d91229281da000d8517751f5ed018
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 19184 bytes
SHA-256: 0a9828f45db78f18d1ffa26e9f77ab9fa5f586be3648dac9e5c0854d536cc11b

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