Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ddde6a49bae882…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 12:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d26992a5425bd4dddc17687747d9cad SHA-1: c0db87fa75570ef717fa58d60c4c229206a0d869 SHA-256: 61ddde6a49bae8826772bebc73d1dec8f73fe3af4f61fca74cff14a434459d11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a tactic of using link farms on disposable hosting to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f125723678---70995505027.pdf In PDF document text
    • https://monographie.com/ckfinder/userfiles/files/depudovibem.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/17425034435.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/pexawebasobofasufuk.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/virexigefiwagakamefijowo.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/faxebuzigox.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/69957693507.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/kexowemekodomepa.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/44504374962.pdfIn PDF document text
    • http://c-amc.com/upload/files/zonadetiritopajubisoluko.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/soxosamofage.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/28410870209.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613087fdb5f64---tuzuzepiworebazozivogut.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/towetowanemisurexetikixa.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/7941926414.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bivukitadajazawafeba.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/kelub.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/wudatajawinagopobuzabivu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/50155143205.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/fozenaxugekuxukosanikeri.pdfIn PDF document text
    • http://trieuduong.com/images/Download/52637754322.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210905164949124.pdfIn PDF document text
    • http://apsons.eu/files/file/21862985511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mac+startup+stuck+progress+barPDF 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_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 17384 bytes
SHA-256: 8b2b7b82f394132173c270954b822d675bb73d1a6c7f490c3b254a9d747fc96c
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 10632 bytes
SHA-256: 7055a240606090b05152a7b4aa91e27cf5b1dbb992225a44c97b521a0ec806ed
font_02_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1