Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ddf8b9e0be9b8d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 00:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78cefa0a3ab7b54500fd8ceecf41566b SHA-1: 172f5bb9f5a34e9458ddc4ae7f603fd9374864d3 SHA-256: f5ddf8b9e0be9b8defce40b0b2c5011f13927040186337f50b5072b39e2c47cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of JavaScript suggests an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=dont+breathe+free+online PDF link annotation
    • https://shreenatharcade.com/userfiles/file/wobexobawidaxonow.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/67368292883.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/7211595064.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/13322084036.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109040350365883.pdfIn PDF document text
    • http://usagimatur.com/files/others/nesoduxupixozuxirutupenab.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/17889802648.pdfIn PDF document text
    • https://kenadong.com/contents/files/91427041070.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/zefadov.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137373834923---rosinomanebavugute.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/zuvofinopob.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/35948658062.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/53998411382.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/katapu.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/34487998328.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/54699997138.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/67374551452.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/21949816716.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/walifomizad.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/67818988338.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/53738734930.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/50540088728.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402635001dc---76977956656.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/jekesirer.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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 18716 bytes
SHA-256: cabc6bef0967a7bac94f871db5c03df5efac381ca36b168c95cfc5b1fb36901b
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10284 bytes
SHA-256: 07484fd6c43f4bf0008d18911658975872075f9b73b62ff37d14ce983640343a
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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