Malicious PDF — malware analysis report

Static analysis result for SHA-256 8338e1004afbf769…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 19:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e158712bce5d942c062e79dd04f0d27 SHA-1: 933d9f2e4b7b65630ead9149d6c83be13647bcc0 SHA-256: 8338e1004afbf769c56555ce1f06a0cbfb36e8f9d3110c350d290ed7834dc443
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, likely directing users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vakantie-noordlimburg.nl/ckfinder/userfiles/files/31759319942.pdf In PDF document text
    • https://happycolaborativo.com/uploads/files/52370700548.pdfIn PDF document text
    • https://angem.fr/userfiles/file/81682640754.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/31192150265.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/96700526286.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/20059778106.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/kenopugas.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/88481530162.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/gogalotarap.pdfIn PDF document text
    • https://maria-galland.ru/files/file/dopivukuvitajixexam.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/88270192968.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nimazukuzu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/54692937635.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/vemilugugorake.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/fusosijorovugomip.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/lodepiwevasazevira.pdfIn PDF document text
    • https://ccskin.com/geektic/files/15858689540.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a7eaeef2481e8be1f0354c77b23ebab2/36011388745.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/kogituxomerepemimibixo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614587214c0b7---31156525979.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zevipuzewesifa.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/kufed.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/53371976562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=asus+memo+pad+me301t+android+updatePDF 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_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 10936 bytes
SHA-256: deed5c836d0feb0a82d6286b22626630ee01bbeb3ea9e973ec9085245f463f72
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 17264 bytes
SHA-256: 075b1fb450ecf71f6f38166ccff61cbd89ff1154668f9f211ab871c18a54f354

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