Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d11e32ade3ac03…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 10:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62d02b4e7b41b49560ba8227abff96c3 SHA-1: 6ea67e1afe5674425f79f1549f896700260e6b39 SHA-256: 39d11e32ade3ac0357567eb3daf2f3d201a33cdbc9036d2df924baa0678abbb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs suggests the PDF is designed to redirect users to potentially malicious websites. The ML classifier output of 0.991746 strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zivotzaokny.eu/res/file/guxobavezufukitotorifol.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3fc467615bafe6a24b6c9d7fabb7c820/jonesufelodosafone.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/buvawuba.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/25312402592.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/xunapokiz.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mabebafalulowebam.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/kodowekagapi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/kurutudopisomegowomum.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/85300357052.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/9231989558.pdfIn PDF document text
    • https://edarky.net/data/file/79008970480.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/pomarirasozomemebalukuvu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/49869388286.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/xopoligugusibikufiba.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/14031681143.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/87863990731.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/jiwivomaxene.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/27438023862.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/tanimiruseku.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613230fc50f71---nivizoturofiluroxasebuvi.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/26395921278.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908192242816674.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/jopelofimuzurunog.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903222740965.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/60331255486.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/lajivijekop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=game+maker+app+download+for+androidPDF 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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10612 bytes
SHA-256: bbed683e010259a27c864a0464e013a17100458f136023d4cffb93dfd81df7bb
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 18512 bytes
SHA-256: ed0d4d5228f044842d10765df7b3bbf923434971ab921bf9643b9844d119493b