Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b1eb7bc3d771cb…

MALICIOUS

PDF

82.9 KB Created: 2021-04-25 08:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08186f0ea21242cec654c039c6e0cc24 SHA-1: 33de0b75c1451759bc336b3452d96c800839292a SHA-256: e5b1eb7bc3d771cbfc8f494596a7e5de8680e619bf1791f310c9b2017d12a724
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used in link farms to improve search engine rankings or distribute malicious content. The presence of a 'Download Now' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The primary malicious URL identified is vilenefex.ru, which is likely part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=how+to+play+minecraft+java+edition+with+friends+for+free
    • https://cdn-cms.f-static.net/uploads/4495536/normal_5fdb30e1b1471.pdf
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/juzuvu_jokotes.pdf
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/likim_boduduketiv_favewolomeza.pdf
    • http://pejefekivuvofun.iblogger.org/42355919142.pdf
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/671721.pdf
    • https://static.s123-cdn-static.com/uploads/4375080/normal_5fe2b00dc94eb.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_605f4fbc5e6a4.pdf
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fde508a2feb5.pdf
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/6ae127ec5.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/rarelasovupubotuzoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dukojalili.rf.gd/17453140481.pdf
    • https://uploads.strikinglycdn.com/files/a110a489-105e-4e1b-9de3-7b672cc9a3fd/msi_890fxa-gd70_ff_code.pdf
    • https://uploads.strikinglycdn.com/files/3ea9ffd4-2f98-450f-a782-2b685738d82b/how_to_use_refine_edge_in_photoshop_cc_2015.pdf
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_0f4bfa75867041c19705d6c6adbbb0f5.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_8934be5eb8ce44b8a71a2ea8b74e28fc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f734.bin
187ccbd5a71d0e28036551231b9391da172c3ae3d3bd236d62c8fcea8a83d5a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 5476 bytes
font_01_sfnt_off000109ba.bin
b4dd81f416a2c03bd02c7a9d7122ae5ec8e94f9ead058a3c2efd67123a1dbb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 10612 bytes
font_02_sfnt_off00012dde.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 4324 bytes

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