Malicious PDF — malware analysis report

Static analysis result for SHA-256 e360344f8d94864d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 14:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63de1b210b16c3550117159c71b65d36 SHA-1: 9db405849e8350d23278c51c43e577d95dd63b51 SHA-256: e360344f8d94864d9d9c3cc2217ddb412833d47a5406b17eeb37195d7c019960
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/88093043768.pdf In PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/29226086186.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/79000409940.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161416463dbf7b---vivukobumetur.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/muruxuz.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/masiwopimadi.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091409194473499.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/ximojodapejadis.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/69746910192.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7345567c02b167d460718446c48cc5c7/vuveperajekulukosamojexex.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/bimapobijodiniwomuwe.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/litujexawugen.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/76605931412.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/gojogibofadi.pdfIn PDF document text
    • http://quinta.cl/upload/files/wawajazi.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/37392689728.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/jofawumevefunoxuvurudi.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/borez.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/20443306261460685a1779.pdfIn PDF document text
    • https://badoza.net/userfiles/file/84687278530.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/datakekejafaginepogi.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305516913482.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/tusazezomosiluwipofori.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/ravudirog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hollywood+story+unlimited+diamondsPDF 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_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 10700 bytes
SHA-256: 237d647050d14887e2fd7dba6557efcadb84c17405263113072d6f1ca53dd353
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 18080 bytes
SHA-256: 16dc129e7660e2fbc4f92a22928220c9264d5fcc473fc9c246e4cc974c796724