Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a65f51f90043baa…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 19:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95dbda925b8c183537ab37a52e0d904f SHA-1: 765186f91c323d496c8edb40d3144c608e2b26bf SHA-256: 2a65f51f90043baaba757af35230596de6396680976afda7c3756f08bc65bd02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to obscure malicious intent or distribute malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cedria.es/DOCUMENTS/FotosFCKEditor/file/nosimizeguw.pdf In PDF document text
    • https://0955205219.jwa.tw/userfiles/files/39880187352.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202199353114740.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/58152045563.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/76580671389.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/rebagesavov.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/525417627.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/36724256498.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/popabawoxusisemofog.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210901182525895986939.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/suratalikifitowinu.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/wozobita.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/takorozedelakufi.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/85238811868.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/penaseliruxerowalejidu.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/93922777228.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/43607638449.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/29baca42dc66d3419a2e83c96b9d8789/zavajusemijaveri.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259e9a0286---gulopirutojumomanapezawuv.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/50536088132.pdfIn PDF document text
    • http://webbuilders.com/files/file/zidawi.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/25303285937.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/90595569346.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906011143605042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+whole+new+world+book+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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 17680 bytes
SHA-256: d0400c79dbf967f60dbedecc27ea729e4ae685f02f96708fb063de4e66652cdc
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 10372 bytes
SHA-256: 2f92b1b688109d0b588a9d49bdf697093d66d072578ccd1f78ad222ae0abd8f6