Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e9546061a9005c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 05:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ebf2a832c4b5c0cdda76b1c681ed9de6 SHA-1: fee94a6027ee98aa246258fb8b8d2f8c3560be45 SHA-256: 75e9546061a9005c3b872a27aacf652e48a33097ca2f8e7de7679c7d9de9e433
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://nhakhoauytinhaiphong.com/upload/files/67602438683.pdf In PDF document text
    • http://tyextractor.com/d/files/nabonoratefakatupej.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145a6fa423ec---90713025071.pdfIn PDF document text
    • http://artediapharma.com/upload/files/zibowawalar.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fodajenujegurowularef.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/debolegexokatux.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcab25e3b0---xujewon.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/83736382375.pdfIn PDF document text
    • http://splogservice.ru/content/file/fujimobekokutavugefuji.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/70973888635.pdfIn PDF document text
    • http://holzweiss.at/petakuvujugapejozeribe.pdfIn PDF document text
    • http://scpt.it/userfiles/files/8743865899.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/kuxunusimekokemuleruwom.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/zitewexugesogoxo.pdfIn PDF document text
    • http://mrybalko.ru/files/zemekebukidazewafitunev.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/2499086589.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/rotogopujuludiso.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/nomufowesurog.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/25526654459.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/dovidepedebiga.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/20070665666.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/12824018149.pdfIn PDF document text
    • https://cmoretv.com/userfiles/56185229648.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/48801917646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=percy+jackson+and+the+battle+of+the+labyrinth+pdf+downloadPDF 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_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 11280 bytes
SHA-256: dfeed739fb19919cb8f338c9a882cc51f6e19efb59e24a4b41052b0e95f86f54
font_01_sfnt_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 14172 bytes
SHA-256: ca11f67c46f441ac0caa0d6da4836ce084fe5a8b25f4fc5d375d3c448051ec13
font_02_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1