Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07bbf85457fae1d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 08:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5dcb196d97811656deafddcd4538aaee SHA-1: d43c6138db27b9eec8f27af258deae71b4e173d6 SHA-256: e07bbf85457fae1d2a13c9401119af35d774cef7830eb41122daa07ce38909b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://tlumacz-francuskiego.pl/userfiles/file/jafuzetikil.pdf In PDF document text
    • https://decoveinvestment.com/userfiles/file/fimunejisira.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/20584491027.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/53721861438.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/xakamoduduxu.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nusujulimusuzo.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/63836109146.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/95473747111.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/rekalijuligoxavab.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/tokid.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/luxeruxasoref.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/namotaf.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/metavim.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/17688038057.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/gukusukubaj.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/pi9j2nfll79te63ke062b018pt/8224372712.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/jogewu.pdfIn PDF document text
    • https://allianztc.ro/files/file/28508942520.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89334560836.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/65149987222.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/zibozina.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381979cca0a---46616778284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=once+upon+a+time+in+hollywood+streaming+onlinePDF 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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 11284 bytes
SHA-256: 10841fb481107f35e662a014d76692406cde59903d1f924779c7ba2155b5f393
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 18912 bytes
SHA-256: 2dcddc9fcd6a60f526ef081d317bd40a22c134062ad85dd058fb305b5e8c6923
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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