Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e0c7ad0506140f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 01:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d6669d9a1eb478ab058a9761e409ce4 SHA-1: ef8a37bc4df6ab743c15097c11f3850149bdc667 SHA-256: 99e0c7ad0506140f8efc7b63da833865e9ae051bbeed5fcad4cb0b4bc16cf338
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to potentially malicious or unknown domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://jowinbio.com/upload/files/202109071304349594.pdf In PDF document text
    • https://rockeit.com/userfiles/file/37279383359.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/92564458304.pdfIn PDF document text
    • http://carbonelite.ru/file/65854597557.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/zevakajorusiveper.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/luzoxowekosebogudidege.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/20363299150.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/viluzuberi.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/dorusefe.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/33466540522.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/974389822.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091212082035.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/1996406824.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/60576278815.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/numezaronevixipatos.pdfIn PDF document text
    • http://e-hematologica.com/users/file/wejezadozotozexojufolezi.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_5A5613DCE2260F29.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/91330249279.pdfIn PDF document text
    • http://secretinvitation.net/images/files/65517450527.pdfIn PDF document text
    • http://gabortech.com/admin/file/tulovenive.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xoxose.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/24698423575.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/diwesixovuvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wwe+friday+night+smackdown+live+streamPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba9c6e068d---tozelitazopapuve.pdfIn PDF document text
    • 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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 18180 bytes
SHA-256: abcc3fc77d327621c636252aaf3d20299506ebdd4bac4362a96e4415748221e9
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11276 bytes
SHA-256: f3583a0111462d8435614ddf713898931a113cc715629eab5dda0b829ba30d1d

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