Malicious PDF — malware analysis report

Static analysis result for SHA-256 3933a432218a0a92…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 11:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39ec194f538ed79863324af7299fd65b SHA-1: efaa59c7d9752c140b81275628787a4ca83b55a7 SHA-256: 3933a432218a0a9246983315dbc6d0060d8cd8bb41b8cf26dafb06bacbae4b8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://everest-c.ru/ckfinder/userfiles/files/xarativigepapazojadaw.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/vetebopebamife.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/gefunuragulenepedobogud.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/raluvobiwetuz.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021932055461003.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/52234865867.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/pusugaderob.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/masisasirupefumumupo.pdfIn PDF document text
    • http://artio.pl/files/files/bawipasimafubuna.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/94734861965.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/72712281244.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/11912560419.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/21561749354.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/15449218213.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/zujisijizuzebirowitozirek.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/4556297380.pdfIn PDF document text
    • https://everestart.com/images/stories/file/33112622121.pdfIn PDF document text
    • http://watch62.ru/files/files/zezobixobunojakovejad.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/lomogaxuzelowebutonasido.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/17514351763.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sibezetevufejeso.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/bapemipusutirofekarerules.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/pesonefa.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/36561936352.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1da9a1f7---jawotaparogowarexedat.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/nadaxopibamonuvesejed.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/dupixanobedijevasokofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=spartacus+1+castPDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 17136 bytes
SHA-256: 377927a05878fed8a92dafcb5380af70ac64fbda090f1611b80edc246c6f28b6
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 10100 bytes
SHA-256: 5c67b68be512fbc6a77eba68e892d8bec27a1fc5f04c5ea752c19d159c252974
font_02_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1