Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5776305d8318c37…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 18:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: beb1163b2f2833ae5a3af76398b7d158 SHA-1: e6983e35b9e273581d9ccb5cee2246814d5f4779 SHA-256: f5776305d8318c376ea51d3d7cdaa7d7c719146f2d90c08b0bfaf41fe8cb09f2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external URLs suggest an attempt to redirect the user to a malicious site, potentially to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=good+sweaty+fortnite+skins PDF link annotation
    • https://nucamsa.es/userfiles/files/75391562011.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/20338843525.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3ee4a226d6e563d322e71b3d1e5fbba3/dikakozigizepij.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pabunoti.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/53042888094.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/70436460570.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/lixapu.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/vegijopovepifekuponepet.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/jibebiperonikage.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/94347453246.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/28060475913.pdfIn PDF document text
    • http://learningkey.org/userfiles/6637849357.pdfIn PDF document text
    • http://cascad-trans.ru/files/67570068106.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/56273761701.pdfIn PDF document text
    • https://mimpidia.com/contents/files/80794158823.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e3372a63d6f371d35e4e059f531227ad/fubixisevajisa.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/67758189183.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/nefujifokeb.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/tivok.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/folozajafiw.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/10107751474.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/zejupovexawa.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/29905126337.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/12014886533.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/wolanodavemalupunu.pdfIn PDF document text
    • http://xtra360.net/campannas/file/46699503750.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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 10632 bytes
SHA-256: 86c0f0a600288e059034860dee9a7569d38a4372bb846bd0018f0e30a54d0be3
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 17164 bytes
SHA-256: bf5bf7ad0269d6bf266ff8aa3f553b1b536be0fb975ec8b134150b63c6195c21
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1