Malicious PDF — malware analysis report

Static analysis result for SHA-256 2718bb58df22855d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 13:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82642e9737c05bce63c4019dfde4bed2 SHA-1: 885dbe274fe69fc8e4ce48fdd66dbda9435a6046 SHA-256: 2718bb58df22855dcc6e6a5fc0770751e4f734cbcdab70c40cf934fd6fb07cb1
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 of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=thop+tv+guide+live+cricket PDF link annotation
    • http://rm-centr.ru/uploads/file/wudigazavosoluwi.pdfIn PDF document text
    • http://unseretochter.com/images/file/mojewinido.pdfIn PDF document text
    • https://ahha.az/userfiles/file/sebazitikomuf.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/tunugituzafisi.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kereziwamajidexoxotusepan.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/34691776939.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/42639815205.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/wenobobabiwavuva.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/14808355116.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/42717607893.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xigefonopumukij.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/94544230918.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/3047405542.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/64375164807.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/jaxumiw.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/bubalewomabuwupatig.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/kuxonuxuvibuti.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/mugupipufikuzab.pdfIn PDF document text
    • https://akemi.ro/hirek/file/61963573874.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec1c92d8e---tuvagef.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/47995504086.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/xowapa.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kuzewox.pdfIn PDF document text
    • http://trieuduong.com/images/Download/rosijaxizumufudupil.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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 17932 bytes
SHA-256: 8ba1373d3710571832df4c9d4963cc87ceeb76c6cde5e50269105d041e8b1217
font_01_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 10580 bytes
SHA-256: 5004ace432457c4a8d850b3cb7bd27c954ecd424d7f5401957dddb0b7c335a0c

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