Malicious PDF — malware analysis report

Static analysis result for SHA-256 c757eb526ee4b4ab…

MALICIOUS

PDF

83.0 KB Created: 2021-03-22 19:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bff267bb6cbf6673e150f6fd9a69795 SHA-1: e4eef2d641e94aff658d205276f09785f4f7bc59 SHA-256: c757eb526ee4b4ab17dca32e6ef71259c4aba1c263a5695a1c159ddcb9d8b313
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=age+of+empires+definitive+edition+cheats+pdf
    • https://lodipopigib.weebly.com/uploads/1/3/1/8/131857338/5773145.pdf
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/kotixajarataji-zojogebof-nabegoro.pdf
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6037349db5f74.pdf
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/vakax.pdf
    • https://lovemaxo.weebly.com/uploads/1/3/3/9/133997317/98feb9129.pdf
    • https://cdn-cms.f-static.net/uploads/4427300/normal_6024ed9778969.pdf
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fdf035e9b527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_8cebcae070964b2c8e2d12f4dbba33b5.pdf?index=true
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_de0036e294ea4731952e548248b4035a.pdf?index=true
    • https://ea29520f-fefa-4c12-ab21-0e0839e82572.filesusr.com/ugd/5d2047_425b958d70fc4590bc0bc03797effd4a.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_6c3d27454a3f4ef0ae8f507221ce0121.pdf?index=true
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_53d092799e10438390c15dbc58475de7.pdf?index=true
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_0584f20438c64e98a235cddee20e6899.pdf?index=true
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_3c2e3fe2febd47858e782c3aef7341a3.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_2a88e362cc774e338e944e4bc68b4787.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_9e06aacbf2c94e638a112d8caa49fdb4.pdf?index=true
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_b42fec36e61c4172a612727746a60848.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_662e60e53b62478fac471ac131d54cbd.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_94b6a2a55f8b4efcbab70f1c3c8ae461.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_76d75429ded64e1db5dd2f954d74cca0.pdf?index=true
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_832f04de93f442408958c2adbcb7667c.pdf?index=true
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_c8f9019fe47749f1a0a3871ae371d5b3.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_off0000fbfe.bin
45c870ea87f6f0541f18e76d9a4bfac969a399e030c28b04ce846283a73429ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5584 bytes
font_01_sfnt_off00010ee5.bin
30f888ce9fede933723f4dc8e37382c37395abdd36733746fd18469d94116965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 19952 bytes

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