Malicious PDF — malware analysis report

Static analysis result for SHA-256 568e8d1db43530c3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 02:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da2baa8344ca9a7e2d9fa4c1baf72058 SHA-1: d036dc193c7e81f6e990c8efed502e5b40c93739 SHA-256: 568e8d1db43530c3ec25b6006d9c498dd0f40caee78ed24161ddc30a12df87ce
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random URL links and being part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URLs point to external resources, likely for phishing or to download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb6926e71---12199219366.pdf In PDF document text
    • http://pnalog.ru/images/file/judomepikukoterupeto.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/pazifofesezalelar.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30929978108.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ripesaporelegup.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/bexaxovevalenunapava.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tawodaxegirepaxozemuke.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a25803145544fd443bea0fdceb6af09/notivuriw.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/19103807720.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/93071696242.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/goxujebadaxotodasasa.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/69864867450.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/dekabov.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/78292796306.pdfIn PDF document text
    • http://sungder.com/upload/3370476466.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/15632280677.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/36839461294.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/xixavuxunesituxi.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/67716383943.pdfIn PDF document text
    • https://majubesar.org/contents/files/907430840.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/73287540791.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/fekem.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/9731335377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+road+to+el+dorado+123moviesPDF 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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 18388 bytes
SHA-256: f032df42ea97c8ac6010e07ff8e73bb7063c8957137fbf9e2c278ed4ec2600ef
font_01_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 10784 bytes
SHA-256: 1180b660ce5a0a2567095aa06aa71a1eae1144d7a8af3854cd3131bd4a86107a