Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb87a990b4e5494…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 18:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33d59d1d10a1d3772508656cbfbfd5da SHA-1: a7eed5836691940d974622e33257ca1156e5302b SHA-256: bbb87a990b4e549465f155fd151a27bef3a18cc7c62d1897cd3f3b2cda6abb19
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=absolute+value+equations+worksheet+algebra+1 PDF link annotation
    • http://gyogytornasz.hu/editor_up/dakeg.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa877bae6---rogasopifarurosagebugati.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a1687a3e---rarumikimo.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/18032655598.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/bubaw.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/33783333197.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/gotejuwosuweruwosodolud.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gareteje.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/botubugefati.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/zirowirologuduwaw.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/47639627443.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/86369279234.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/bewox.pdfIn PDF document text
    • http://rld-carbon.com/file/momokonejivaravugukosano.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xomilevabixejikevonixafi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/puwemiponir.pdfIn PDF document text
    • http://asustainable.com/global/file/451543898.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zabotefafovizigaxurebodod.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/081435104240.pdfIn PDF document text
    • http://labradory.pl/file/resotekewopamatugopeg.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/19618663868.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/15070335779.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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 11048 bytes
SHA-256: f7bee4c66f2e30d95446a8ab176bfd9203be55972c806879221605313aa67155
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 17936 bytes
SHA-256: 7263e8b3db6416184fc446c6e3d29645bc5040f012ea59a37b92e47748c755d5
font_02_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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