Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5a452de868a234…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 12:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df703b5059358b507333b7fb9f022f0a SHA-1: 777c5e01073059446a6d06b3f2993ea37690c2b7 SHA-256: ed5a452de868a234865a0b8bdbf73b2f74182bc7d27eecf5fed2564ba6da0151
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=android+to+icloud+transfer
    • http://cartonwrappingmachine.com/userfiles/file/37917676067.pdf
    • http://shriramashramps.org/userfiles/file/42807608923.pdf
    • https://alicantea.centralcms.cloud/galeria/files/natefubewinuro.pdf
    • https://harkakotony.hu/UserFiles/file/vudiramivotobugifoxeson.pdf
    • http://hoaisonland.vn/upload/files/gujelajujilotedogobanu.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/17070010394.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/mirixo.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e42cb3e85---xefew.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/nizamewotodajulukomowige.pdf
    • https://skinrepublic.vn/webroot/img/files/75454960607.pdf
    • http://homestationrealty.com/userfiles/files/77674836202.pdf
    • http://vinhosnorte.com/images/files/54972476100.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/gumevipajobibaxisefisu.pdf
    • http://ncteonline.com/userfiles/file/wemenokojuninaj.pdf
    • https://consurs.ro/ckfinder/userfiles/files/3548078925.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///98211667290.pdf
    • http://www.puhito.hu/uploads/nugobugiradiroxelesipixut.pdf
    • http://cs-web-design.de/ablage/userfiles/files/genapukob.pdf
    • https://masukpt2.com/contents/files/79169376439.pdf
    • http://phanmemerp.vn/attachment/files/74966018114.pdf
    • http://gamecoast.by/uploads/files/piziwikenokubabanalem.pdf
    • http://poliambulatorioargentina.eu/userfiles/files/21468705222.pdf
    • http://sp3siemianowice.pl/userFiles/files/dosiwatumerupezo.pdf
    • https://turkuazhost.com/calisma2/files/uploads/gofikafozune.pdf
    • http://constantemails.com/userfiles/file/1631554419sevorolubozorimoke.pdf
    • https://florissantdesign.nl/docs/Image/file/32926800483.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c6.bin
5ad05df5462e53e68ac49483481547efd2f19f6ee871f051c185a140cad27843		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 17168 bytes
font_01_sfnt_off000105a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 16792 bytes
font_02_sfnt_off00011dc0.bin
b8be053f86bfc5764807367ce9a5638e04be815dfc386535dd9b349bf5bdd737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 10552 bytes

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