Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb61604ca74274b7…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 18:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cfe1d5e04ff6cbf4b5817d3b1a51b88 SHA-1: 51c99a4300e429a4d44cdfe89ade57b448cb3eae SHA-256: bb61604ca74274b799a33fef4688d5b8a93191b6bd250fb90517a05f4961965d
134 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 and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious content. The presence of embedded JavaScript suggests it is used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krisoc.ru/uplcv?utm_term=windows+10+iso+image+file+free+download PDF link annotation
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zesuxo.pdfIn PDF document text
    • https://dalba.net/other_files/File/22778483049.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/73071362692.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/golopiw.pdfIn PDF document text
    • http://sbairs.com/datas/files/3945434137.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/57551779204.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/50188516990.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/41710675053.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/25742206030.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/72772447652.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rixezagobagaveva.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/92370462656.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/66933747453.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147915ba6127---1504324717.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dijalaxepuziruwatesa.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/panarigelexikujane.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/kebilixobifugi.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/kexosumel.pdfIn PDF document text
    • http://bibikid.ru/upload/60131074796.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/48538661550.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/baridakonil.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/kavinisaxoxizifalulozilen.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5s8tle2kmal2cqcgrgb0lbtvf2/89047612660.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_off0000ad7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 14444 bytes
SHA-256: c347bb5f4cbc5b7b9c9d9e17e180d74bfb72f766f170b440b34680a87d4f4076
font_02_sfnt_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 10852 bytes
SHA-256: 61db9a941ea48849a255a2a700d8070fbe40e5548392a95bcc5b3496e0e5cc55

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