Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6e544f34b789d5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-23 10:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 510ca5a2da0fd7b01f458ff30db62e12 SHA-1: 1ce94acba86577144d1d1191fdacd66c63ff7f2c SHA-256: 8d6e544f34b789d5a6e54634b0fa488051ad918d23d5bcd8c37d9a51e5dcb467
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://e-midas.ro/files/file/bokesukiki.pdf In PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/79605576777.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/22385276636.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/ferozevatuxogajulikigoz.pdfIn PDF document text
    • http://crm333.com/documentos/file/kaxugonetemes.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pepisedurosejubat.pdfIn PDF document text
    • https://x-software.cz/data/file/jorepetidiw.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/zagebagexufogi.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/54058974483.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/29198699284.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bufadapuxuzigavik.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/zorez.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/93785232171.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144d1f053ca8---1479825441.pdfIn PDF document text
    • http://kolesa.sk/files/52898476929.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/dibivog.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/rudowotebalapene.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jatuxusesowibebid.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/71967088579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=south+indian+movie+appPDF 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_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 17436 bytes
SHA-256: 65a7bf1c55d246e1e2b9b79e62d3c437de1400178c36a9ce03301760e4158068
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 10584 bytes
SHA-256: 8e415700b9e8205d131ca5c99aa3e8305d267133066af1110aa5ac224bcea969

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