Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d266c8f340ce27…

MALICIOUS

PDF

93.5 KB Created: 2021-09-18 06:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e20fc90c1ed64a92ea1e1790999ed607 SHA-1: 6ee7bbaa18f7a909b12d8f5893613a6e44f280f0 SHA-256: 16d266c8f340ce279d3251613ecb50f2973fdfa1534d0f59c2850e1cdd66fb3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://asoriofrio.org/ckfinder/userfiles/files/81767371913.pdf In PDF document text
    • http://wahluenfty.com/userfiles/3748316616.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/vulubetuwikitaseforuralu.pdfIn PDF document text
    • https://birotex.rs/images/files/96229536543.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/53658698168.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/woluseruzifeduxiza.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/jununasafigidajusive.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/nupesawijuvotaneki.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/lavoluwelib.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c12f399ec---54153261172.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/19825413541.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/19682149057.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/1651543748.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kojejokawemokirulupo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/wemajilowopoxerifetanifa.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/sajaxir.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/65380816096.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/69181568663.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/22205151473.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-4/20210904215232467731.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jexolikenawaxo.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/25964664689.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/24840672150.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/94399174409.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/32573672613.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/55474332309.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/34803094328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=abraham+bible+study+pdfPDF 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_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 10876 bytes
SHA-256: c7c37cc2f0482fdaa69a8a833bfcd05bdece0f3b450ee16c4c051865e0d5d709
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 18416 bytes
SHA-256: 4e54dd0c4aa04e417b1c04a5e3f2b93bc9dd0dbceed1121c5d50e3fc450d022e
font_02_sfnt_off00015018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1