Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d6ea524bcb2cc0…

MALICIOUS

PDF

76.1 KB Created: 2021-10-05 10:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e6bda383bea98b253f31560aa540d15 SHA-1: c4753e7efc8823a5089be9913ec1c7542cd7bf48 SHA-256: 81d6ea524bcb2cc08c7c9b21af8b62e93d607d4d8a476e1bbfaa62193c3210cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://crysiq.ru/uplcv?utm_term=matter+of+discussion PDF link annotation
    • http://mimarkamilozkartal.com/userfiles/files/kibivisosabe.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/70174583261.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/63231831709.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/20802960339.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/93489431840.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/87368200144.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/72170122964.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/87110083728.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nobufuzeleler.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/12127999148.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/12774438416.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/juvoziguge.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/63418377442.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/kojunised.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/bunijoxunedilitokon.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/28432695976.pdfIn PDF document text
    • http://generaldistco.com/images/file/40900524083.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210929063752.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/31713530967.pdfIn PDF document text
    • http://kco.su/userfiles/file/80115231687.pdfIn PDF document text
    • http://brukbet.com/user_images/file/bogideli.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/48384536237.pdfIn PDF document text
    • http://mlsite.gewoozee.tw/custom/file/gudesofepiwovamovuvedizo.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/35323009268.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/sawawesekajomijizokogi.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/64972382841.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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 18028 bytes
SHA-256: b179bb8e51333cf40bf498684145bdbde69b62a69a7aa96d5ce49e604a950001
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10516 bytes
SHA-256: 16e0837d6326349b3e4f4c1179d54e53d15f3c7fad326d9ebd69ee4b2bb68f40
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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