Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36ae2b5379cf7c4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 17:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20f0fa79234f5310aaa9ec82bc2dd43b SHA-1: 7737e646380e4b039ca8946c6a8a2f97efddd302 SHA-256: a36ae2b5379cf7c48f6fbbda6a69f3ebcf0d4c5f56066204fa72b23303ce2687
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=best+selfie+camera+app+download PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e307768793---vapuxoxejajox.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kijujuka.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/davagazezepeb.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/52825966246.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/11173345020.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/fugofonuzuvuzuredarino.pdfIn PDF document text
    • https://palet-school.com/files/files/83928921335.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/6972557036.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/62960527305.pdfIn PDF document text
    • https://franchiseinnovations.org/broker-site/files/files/komokozoladojuwu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/80127087510.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mefugoxixupimazipasaz.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/81964824944.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/sadaninitatukik.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146568cf0721---kipedozunodaj.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/32400469410.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/78317039509.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/94516918798.pdfIn PDF document text
    • http://zubrcup.by/files/files/kepulafumitafimetixej.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/61824615095.pdfIn PDF document text
    • 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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 15968 bytes
SHA-256: 44a72a35ff56c0fe0092b5e16a957a7235f69226bd56e2e533931dd36c4dfd44
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10920 bytes
SHA-256: 7309dca9c98803fae1c8f41b057bc0f3f7eb2a6f60c3d07e76da522521382b22
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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