Malicious PDF — malware analysis report

Static analysis result for SHA-256 77641d5ac88dc06f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 07:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c94eebc3ca112e11bc3c408929146a9a SHA-1: 1ab893a49336d9e939eb2748419499075fed1a5c SHA-256: 77641d5ac88dc06f4ca7f1a4211dc680ccb5f292d30ee1607a5b50ce39243432
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ikorti-iao.com/userfiles/files/92811004108.pdf In PDF document text
    • http://yigang-lin.com/uploads/files/202109101102419886.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/letije.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/82391728203.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/lelosebijasilurevela.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/36672362654.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/boraduwaduban.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/49155251317.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/jikimuw.pdfIn PDF document text
    • http://lecostationery.com/files/file/vosoranimufoki.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gorijavumevutebu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911095907767064.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/jowatatif.pdfIn PDF document text
    • https://aedwea.com/upload/foto/85339661897.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/67444101238.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/52891617876.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613034ed3dbab---93289592953.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/74240003711.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/27015798951.pdfIn PDF document text
    • http://xycrusher.com/d/files/53504916185.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/wojamiguledow.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/vobipinadutifiverif.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/10590673971.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/25396266884.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sg52us2glhdq77e89dc4iua9ir/selagugukudep.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/36781937395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=descargar+el+juego+de+minecraft+para+androidPDF 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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 18976 bytes
SHA-256: 8dd72df52c6e6bdcd4ed2be79e04eabbc852c541937f2ec7161c332519366d48
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 11196 bytes
SHA-256: c5b68537467363314c3013307e9c5c595a69d3c90aab897795032df0ed4805ae