Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cc10629fdc6ba4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 06:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4594aa62ee4608c6f739e2bff9eae0c SHA-1: 0f59c558b634e880564e7b3e8c25b64c74efbb5c SHA-256: d2cc10629fdc6ba43084a9e03249fc23726fc03df254d4d9291ae4f7603004f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also includes numerous external URIs, many of which point to potentially malicious or disposable domains, suggesting a link farm or phishing lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cukimentescukraszda.hu/files/files/99646692158.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/kubigapal.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/26075182887.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90085935810.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/babonagajorodo.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/xurufojavodinaxalisisep.pdfIn PDF document text
    • https://eternalbliss.net/file/niragogabuda.pdfIn PDF document text
    • https://capecoralliving.com/media/file/tamudosorup.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80773287428.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161449eaf43eae---ginizix.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17472910729.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911181918285801jtiw6i.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090903090196983.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///venekuzewebopadawalenamaw.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/70544818832.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/lesexufatofof.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210921_8CD84E68E08F278C.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/domikanu.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/lilifurevugu.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/38668045710.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/bixuruvozaguken.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/melepiji.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/sinigowilolesez.pdfIn PDF document text
    • https://durimawar.com/contents/files/jikisimiwozubiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=copy+bookmarks+from+chromePDF 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_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16596 bytes
SHA-256: 44921af2d608cff59f9c6697a9b33f9d4d76b13d9e712add9a4c8d3b8c484f52
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 10784 bytes
SHA-256: 7f145ca4d4803de2a98966a87562687314c502d0c9a8ca4171319f3900d9d6e8