Malicious PDF — malware analysis report

Static analysis result for SHA-256 151d14a6b7bc653a…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 17:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8336a748464a6d1ec47c892b42079db8 SHA-1: 6843c401a6905fb3dc58c91d9ed986a1ba932810 SHA-256: 151d14a6b7bc653af0c73c7a996125695e96467371f4d00807475c60afbb6449
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://sakesushimn.com/userfiles/files/mikalazijejabelotewix.pdf In PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/65804874236.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1422740d453bff5c7cf127691542b0c7/38587634362.pdfIn PDF document text
    • https://akvaguru.hu/user/file/32388861639.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/38147229404.pdfIn PDF document text
    • http://htwy.com/upload/file/sixuw.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rokerisuxevividi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wodulo.pdfIn PDF document text
    • http://techbis.pl/files/file/14944959773.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/pefopogi.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/kujemuluj.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/fadodokudini.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/segonoso.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/46074148997.pdfIn PDF document text
    • http://debten.net/UserFiles/File/perijugizubebedinoni.pdfIn PDF document text
    • http://techmechengineers.com/uploads/xojitazopinimotaw.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/98223629903.pdfIn PDF document text
    • http://runhouchem.com/upload/files/viwarogegebivixufa.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/korajofukopuxigen.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330f1119358---mesibobukasofoxudimefula.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/65973499227.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/69229475074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+openvpn+client+androidPDF 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_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 16936 bytes
SHA-256: 2fd297bebe9398ddcf8052ca1f08e6658bb2d0e056a3d5a8089b9bdf103e9d5d
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10628 bytes
SHA-256: 7dd967cc6d7828888ce7ade96d020c44c8a765dd80c9905afdcd1d6376c7cf7c
font_02_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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