Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc27dd9536782bec…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 08:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9c3be5d240ab8305951caf20ed15658 SHA-1: cb746f964b53597cce37be024b5df308ed55103a SHA-256: dc27dd9536782beceb4db4f0357b1885e75ea5612d38207c70ff81a3f1d81fca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm designed to obscure the true destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a pattern of using disposable hosting for a large number of links. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4ca0b55a---57369076040.pdf In PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/suzusuwotafawup.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/nezutezapisuxizanuvave.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf22ee98d---buforobenetax.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/50204033890.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/tutasogijifidazovoliga.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/27616557050.pdfIn PDF document text
    • https://shunnasato.com/waloduvej.pdfIn PDF document text
    • https://architektor.ru/uploads/file/69290781556.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/kuxuzekujorajora.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/dudutobowajitozudoz.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/puzefimimoz.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/19389671284.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/95518311123.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43017447287.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gipuvixafirufoxerasi.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/76349858247.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/pofezava.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/puxelibapiniresodugogoge.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/29374396546.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/tifatijoju.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/61111760900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=world+history+patterns+of+interaction+online+textbookPDF 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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 17860 bytes
SHA-256: b3a05ce4b78c63627dbfa55a301eec16e8c6198b74e9d8db475e80cf943ffd45
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 11156 bytes
SHA-256: efe9dc39ad5c2f94d7909a9fcaa5fc7d25495dbf6fe0421e156843761f8e3db6
font_02_sfnt_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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