Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc492595da050e3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 18:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffbd84f852bbc0dcf15ceb70301475a2 SHA-1: 867b9ee05e82a38bedc6e827a64d5675df77fcfd SHA-256: 0fc492595da050e30595d9f65bb69d06d449456fa2b28356b36a20defd35b893
156 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'vilenefex.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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/123?utm_term=call+recording++please
    • https://dadajiwo.weebly.com/uploads/1/3/4/8/134881642/xugifebatazusu.pdf
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/tudemoxe-vuvowesisabaf.pdf
    • https://webemibas.weebly.com/uploads/1/3/5/2/135298215/cab0587b.pdf
    • https://cdn.sqhk.co/seponidozit/hgkIjb9/loop_diuretics_calcium_magnesium.pdf
    • https://cdn.sqhk.co/jafetegupam/hbghjik/free_download_my_talking_angela_without_play_store.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/5303133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3112eb11-6181-4463-aab3-b0c0a11eefef/jquery_cheat_sheet.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_e0cb2b02150342cd9a7993abd1d0c24f.pdf?index=true
    • https://5a40d117-9b5f-479f-8237-fb11c9f05885.filesusr.com/ugd/97634b_4d4a940d87a341698767fe56b1b46132.pdf?index=true
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_c4fc9662b9174fdda9c5d39e1092d71f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/093b53ec-8fda-433c-8ae9-0859c7e496d8/17944768432.pdf
    • https://s3.amazonaws.com/kofabube/microsoft_excel_analysis_toolpak.pdf
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_332810798f5249abbc50f6c35be36dad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86ba48f2-a3d6-4ed5-a7cb-f1f0738f7551/suvaburenibavokone.pdf
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_ed04a7a99f3e4fa6a4f67e4aa37cef17.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_e6812cd0564f4cd68358038a679d67a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/95136e3c-908f-4bf7-9ba3-db458a937703/panasonic_kx_tgc210pdb_opinie.pdf
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_c9862a60435f4b698cfba8d8b14bfcec.pdf?index=true
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_bee25f637a2d40f4af29d3fbbf929c83.pdf?index=true
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_40c89ccc253c47fb85c8eb391c258d7c.pdf?index=true
    • https://s3.amazonaws.com/bubeto/67031868182.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead2.bin
fa7ac569029e5653be12891d02b1f325a341e9fd55d24236b3e0bd1898f7336e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 4972 bytes
font_01_sfnt_off0000fbb4.bin
2bc4c03d5e3fcff27440f4bd8e26fc94c08f68e1621b3ab4627a9bf59d4c582d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 11036 bytes
font_02_sfnt_off00012187.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 4324 bytes

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