Malicious PDF — malware analysis report

Static analysis result for SHA-256 7413a27d1623598f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 00:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1983b38db36aebb8fdb7b13f4ceb52d5 SHA-1: eeac21bd8dd51d7a70b4c7c04ec1f8922242ec18 SHA-256: 7413a27d1623598f74e339f4ab0556e43e70927daf9645ca3eb03800ddfd6bda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to suspicious PDF files hosted on various domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://bankubezpieczen.pl/userfiles/file/paboxarubizudaxuzuna.pdf In PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/raxinepikexujomore.pdfIn PDF document text
    • http://emannsltd.com/userfiles/38870349842.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/rizidapepu.pdfIn PDF document text
    • http://nktrading.qa/file/files/39207841826.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/tusosovog.pdfIn PDF document text
    • https://poker-fire.de/file/64662816460.pdfIn PDF document text
    • http://telecycling.info/files/file/pifokozagomokowuvubi.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/79328008065.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/wibunilamilokurewaxo.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/87888946239.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/97618376440.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fofopuno.pdfIn PDF document text
    • https://phukienbep.net/media/files/27451622124.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/zaximavanefubipodanekobed.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/zumobopopejefatubi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/53465889161394ead74a74.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///80226942395.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/76836878280.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/83361067442.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/wirezugozedowufarigipeza.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/lomubakegapapak.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/nazowilu.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/vezurifet.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/61507083976.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/48187088297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+screenshot+snapchat+2021PDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 17180 bytes
SHA-256: 15ede29bab916398e4572e3027b69439d8edcf09cf55c547d0d5ed0796f90499
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 10704 bytes
SHA-256: 88c1d8673ebb9fdd93e92d8f9e1f49e5c3c14d33a0d267839cf71df59d5def02