Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fa01f2b97d5a55…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 19:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe6eead64eac3f1afe33d4903dc0ec84 SHA-1: c39c10414ea88abfb5cacde56da9d369b7eaa5f5 SHA-256: c9fa01f2b97d5a55cec328740609b0d958ae86976a9601cd75da4040faded519
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious or phishing websites. The presence of JavaScript and the link farm behavior indicate an attempt to execute malicious code or lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=123movies+star+wars+clone+wars
    • http://mstreatmentadvances.com/userfiles/files/nodirekoletufowumafu.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/41099686696.pdf
    • http://pentas.eu/userfiles/file/fuvapadodevewi.pdf
    • http://pronobile.de/catalog/file/wurutuvobefidasadatuxo.pdf
    • https://myreply.mobi/snappshott/editor//file/3560393801.pdf
    • http://sp2wronki.pl/fotki/fotki/file/79394522779.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/bevujideselozo.pdf
    • https://rent-1.es/ckfinder/userfiles/files/78735213114.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/65360774282.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/40569782619.pdf
    • http://volvo-cars.jp/js/upload/files/98179236297.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259473dbe6---15453124351.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22ad75dd6---zubesabewirenigokepomud.pdf
    • http://www.heksan.com.pl/file/21411454411.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/wuworukuwepomefi.pdf
    • http://kaies.net/upfiles/file/62692446729.pdf
    • http://travelspace.pl/userfiles/file/ketegovij.pdf
    • http://resortvillairene.it/userfiles/files/ratiwodowofusu.pdf
    • http://fairway.cc/images/blog/file/52624176205.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/42046593072.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/38120183075.pdf
    • https://riwg.in/userfiles/file/60813865595.pdf
    • https://anfauglir.com/images/file/72967520901.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/61281602257.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_off0000effa.bin
fdb9da50d9f86fe894c6c5c1f9e6dee2314c032384bd3460d81394652655b4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10792 bytes
font_01_sfnt_off000108f4.bin
b0390e132b4c0520915d67532f0ad85538b9b329d0862f5e6d0fce9a5c27d0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 19360 bytes
font_02_sfnt_off00013ba0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA0 16792 bytes

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