Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd43dbca23d098de…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 18:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 385b7e4fe9663bcb76ee28cc87920c8d SHA-1: e1bcf5037b18445489c5663b414db08947abf4b4 SHA-256: fd43dbca23d098de6cf327a2f6aac3c1c3e6dd9aa4a4ca562af9d0510824c9a4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs suggest a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=joi+apk+mod+download PDF link annotation
    • http://eltprof.ru/userfiles/file/92424043821.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/49730187347.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/33487948446.pdfIn PDF document text
    • http://888chji.com/userfiles/files/filuga.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/texumotopowapotuwopiwusa.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/40984004654.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kaletumufozegodefiw.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/wanunuwewuzunedila.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/razazag.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/rabeg.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/44376600582.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/sazamidudexitimugakinel.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/nesunulafefewut.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/83971557200.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/jazutuxu.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/dowonabejuxexoribenap.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/50424393054.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zatozuzasovi.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/ratodo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54184955325.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925310e40f---moliduwovijunuva.pdfIn PDF document text
    • http://dominant.name/userfiles/file/22691879414.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/doluxuleleronowulik.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kirajulikaxitoz.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/20837439074.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/lidoni.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905195752866452bf4rdl.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/79509636073.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_off0000c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 10224 bytes
SHA-256: cacf6881ae60da7b30b9388e3163191f70ee95c6fe68adabe0ef987a21ff1cf5
font_02_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 18480 bytes
SHA-256: 4371cd247981362a2c3449ecebc7ba683089ed9e347706d478c0e0e6e90f3376

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