Malicious PDF — malware analysis report

Static analysis result for SHA-256 318303a37063c55f…

MALICIOUS

PDF

97.0 KB Created: 2021-09-15 13:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a380b6dc7505ba2979567ec644a6f86 SHA-1: 91043807f6d558d1ad6051f26b9bf5b31244ceef SHA-256: 318303a37063c55fb4785c481a68eb5c7ffd999a7344bf2d1957f2946f6f4444
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, with one heuristic specifically flagging a PDF link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked PDF. The presence of embedded JavaScript suggests potential for further malicious actions within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=note+10+roms PDF link annotation
    • https://rajatotogroup2.com/contents/files/biketomanes.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jawomave.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/7711105117.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/67420124831.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/tudofedevowusat.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/kekidirivowunililozarixov.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/zodiwipogalozo.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/pexonunedevaboxo.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630785953.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/polizuxuwodafurajulebin.pdfIn PDF document text
    • https://ienter.bg/files/10706074183.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/89010459533.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/femuserew.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/pevufodulenavovi.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/17702016910.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/62185919909.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/39m8rpo9miqoo3r0c206pib086/33250554116.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/16255896594.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613933396fe88---mekopumozefikakamotuw.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/57778904575.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/tumomusafafanemo.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/duzuzapowazitatekosiv.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/niwinakamuk.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_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 10016 bytes
SHA-256: 0e06c9f13a884a578926106310ddbf4e1a0a558c118e3feb79cea50a38743c5f
font_02_sfnt_off0001421f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 19964 bytes
SHA-256: 0fa6ac7e8f0b0b84ec82171de79242da6e975f056493906cc9660fcf6c18719c