Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7980095991e554…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 12:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1330539559a406aba5e455b98421c2 SHA-1: 27100c2ac9e1f27cd7cb1000df5da5e411aa8122 SHA-256: ea7980095991e5546bb12ae41dd2eb97e798a6404b5e6d85b2bda239ae281146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The file contains a large number of external links, characteristic of a link farm used to distribute phishing content or redirect to malware. The presence of embedded URLs and the overall structure strongly suggest a malicious intent to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=blues+for+mister+charlie+act+i+pdf
    • https://cdn-cms.f-static.net/uploads/4452395/normal_601c5c104dba7.pdf
    • https://cdn-cms.f-static.net/uploads/4530070/normal_6024672d1aec1.pdf
    • https://static.s123-cdn-static.com/uploads/4369322/normal_5fe5a5df45cc7.pdf
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5ff39c2e9bde4.pdf
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6014fac4e6fa4.pdf
    • http://zovofuti.mygamesonline.org/hematology_ethiopia.pdf
    • http://rulajamizap.getenjoyment.net/75261113782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_0eb83146f242402dbcf5eecde079613e.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_bef06fdbaca34ce38a6e12b5be94a9a3.pdf?index=true
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_cceb28451b7c4e17a475e5ffb391bcbd.pdf?index=true
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_24c6166e73fc4141a613a74e2dbbd916.pdf?index=true
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_b26160df273e4d469715712f8dcb97e6.pdf?index=true
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_a2e51bf4239647e7ab040203c03e591f.pdf?index=true
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_e64290301a1b4eccb891d3d3c0fa3ff4.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f445.bin
1224bd5be87927903559e80367b1b72901e81726eee7c95350d8f2a804651dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 5444 bytes
font_01_sfnt_off000106a1.bin
e0ec3ffde045f1aa04b826b42277c399a756825e200399004d1455b59d23e1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 10428 bytes

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