Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488ddf61812efe1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 07:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc591a796b736e73fd802dde45028e8c SHA-1: 451e50cf9e966746c6e0a1726f7cb76bac98b8a4 SHA-256: d488ddf61812efe1994f4f7e7872b6fa641a85c47aed4a2e515187c0b4779d2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd18aa826---salusawiwa.pdf In PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nujujogisef.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/92386727923.pdfIn PDF document text
    • https://fptica.ru/images/file/sasefijipedojazozelib.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/31516012909.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/81238614773.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/53a7525860e9f222b004dbe07a444f37/serixadodenef.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/10564314505.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/60971376744.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/fusez.pdfIn PDF document text
    • http://medi-sen.com/files/files/32460171363.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/xibegufexerinojilixen.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gexikawi.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/zufidunamaferu.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/58835963180.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/28521773637.pdfIn PDF document text
    • http://ruresept.ru/files/file/36122971636.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/45720749099.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/22443703555.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/99041983203.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/41283238298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+block+games+from+play+storePDF 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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 18112 bytes
SHA-256: bfdac90988e8a44d5e724ea4ee329be50c5ec003ab18132edfd76927021ea66c
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 11048 bytes
SHA-256: 9df47b3d152cc4f6903cfaa100bb76407dffb12205bf74ef894bfa4e96a2c2a4
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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