Malicious PDF — malware analysis report

Static analysis result for SHA-256 a184624e93710922…

MALICIOUS

PDF

93.0 KB Created: 2021-03-29 10:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8013404fe8dcb2de93b103e1e11d53a9 SHA-1: d1f31c90ac479bb106df733714c37861f96c4a66 SHA-256: a184624e93710922f907a7e6441d74c8e2d0d0f6a5733489ecfaf5c2bdb09eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to malicious websites. The ClamAV detection and ML classifier also indicate malicious intent, likely phishing or malware delivery. The embedded URLs are the primary indicators of compromise.

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-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://botokaw.ru/award?keyword=bribery+definition+pdf
    • http://vegunax.getenjoyment.net/6110966072.pdf
    • http://subfamjtii.site/chrome_extension_react_performanceb8tq7.pdf
    • http://janipuwibir.mywebcommunity.org/muriwegefazuzigitogijezi.pdf
    • http://keepxufi.space/lenovo_g50-80_drivers_windows_7_64_bit4c9m1.pdf
    • http://lnstagram-help-businesss.com/pagalword_bhojpuri_bhakti_song_2018fytxi.pdf
    • http://stankoff.org/murorirulebugoboduvawiguw98csn.pdf
    • http://prizinsta24.site/lol_coloring_pages_to_print3nj5z.pdf
    • http://jakusavu.sportsontheweb.net/87295325732.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_24b210d8924f487fa9a8f13499a484ee.pdf?index=true
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_6b5ded3f641146b3bbcbb8f6c8634ba2.pdf?index=true
    • http://gegetebipa.atwebpages.com/notas_de_acordeon_de_teclas.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_2a7822e4a19d43e6a8f882518a6607c5.pdf?index=true
    • https://s3.amazonaws.com/jovekus/sisizamoxovidirolit.pdf
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_62ffe6cf9b93482b8854c5c50bd577d2.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_5ffa26f84b164a9eb246ef0a9546ab63.pdf?index=true
    • https://s3.amazonaws.com/pavujiniz/how_to_program_new_remote_to_viper_alarm.pdf
    • https://s3.amazonaws.com/xajowu/7305719664.pdf
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_fe12ac6cc1df4f29b0b3c5a63aafd1da.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_off00012efd.bin
057ac349aa3f48a26590cad4aa9646b622e317dd32ff4e149a3c4356e059e616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFD 4908 bytes
font_01_sfnt_off00013fc5.bin
d6db0f13275266d34ceed8bc5626ab065686e714f60ed9b77d6a5efd12cc09a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 11528 bytes

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