Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fbcf40ab56acd4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 16:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00589881135083d87f25710a9ad7a9ad SHA-1: a24e56014b256ee1c78f1b63342740740505a7ef SHA-256: c0fbcf40ab56acd4ee283a9d7b6ff931067e3d2325de37e8c4105132b81e3313
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/xorewizib.pdf In PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/padidosudipotut.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/73268310246.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/37969384312.pdfIn PDF document text
    • http://anpharma.net/upload/files/41213986830.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/bepipeke.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/62134074348.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/gemomalavimuvaw.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/65703342850.pdfIn PDF document text
    • https://cardolf.ro/files/80335508525.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/bijomuxuju.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/tevuma.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jetodowa.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/mifokop.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/vamufotimi.pdfIn PDF document text
    • http://poliinc.com/upload/files/kowobuteguvusaxala.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/31914108527.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/35086077133.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/wejube.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xapuj.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/93852911031.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/31124270810.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/winupuguba.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/lefapafapanizogono.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/73242740840.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/vomavixudotifuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=idle+heroes+hacksPDF 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_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 17160 bytes
SHA-256: 18a63a097780d0262c8a4143247adbfed53769797ab04c7e43d266cc9830e39d
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10216 bytes
SHA-256: 930f4f0c1724265d730a2397e8faddd2d3b233f020f004da2eedbdf1ffd28c64