Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c94c2121b31fb3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 10:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e7349ba006f51d495f05fede7da51cf SHA-1: 7b026104101dd18b6801b96d0a25b5eae0bb8ea5 SHA-256: 55c94c2121b31fb3ec5b6d894eea09e76fd4e2ca2a669cc2a09626fb31a11c11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including a link farm identified by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to the link farm, which in turn hosts more PDF files, suggesting a campaign for SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pokwuttibut.com/file_media/file_image/file/39095090342.pdf In PDF document text
    • http://nilesk.com/userfiles/file/dunawadafedimanubaxaveka.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/36298916577.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/vetenotaxuvulasarusanis.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/84002029149.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/seniwulaziwaxojaw.pdfIn PDF document text
    • http://iphysiology.ru/upload/ritej.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/fikaluxijukuxujuvigalo.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/58835963180.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/kemebabiritar.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/21191776251.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c651a5fd6---xasusekinemip.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/208054bb0834f5994383c80c55c72ea6/92832784172.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pewaje.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/somaripediniku.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/26370091761.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/23146140579.pdfIn PDF document text
    • https://kawanmto.info/contents/files/wobodopominu.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/tusewodorijotivus.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/raxujovodijenovevutekegu.pdfIn PDF document text
    • http://rideco.hu/upload/file/59298590338.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/fewonufijobulafubikodur.pdfIn PDF document text
    • https://harmony.im/userfiles/file/38348737073.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/mesakamuxamigopuve.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/9103363897.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/kujofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+talking+angela+hack+mod+apk+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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10976 bytes
SHA-256: c51afa029d65836d5f8fc35238756c3f350bbf0fda56735930ed5525555a1b41
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 17496 bytes
SHA-256: 5d1ed2d544eb295dd14ee5f6d57ff20f7e8b032c5a9adc2fc2b6fe668de157e5
font_02_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1