Malicious PDF — malware analysis report

Static analysis result for SHA-256 b672bfc613423499…

MALICIOUS

PDF

100.6 KB Created: 2021-04-05 12:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e222c08a8fe635b1e5841b4b5ee3181 SHA-1: 61b6992d9116db8a66b4afe5817609e7ee69dfe3 SHA-256: b672bfc61342349903203e7e9d1da1fad33b8930ecd9adf3c8194b8e4dbd11a6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. One of the embedded URLs, https://nipisod.ru/strik?utm_term=samsung+galaxy+tab+a+model+sm-t580+case, is particularly suspicious and likely leads to a malicious site. No scripts were extracted, but the overall structure and numerous external links point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=samsung+galaxy+tab+a+model+sm-t580+case PDF link annotation
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/kuzomu.pdfIn PDF document text
    • http://fojozefamofu.22web.org/cellulitis_idsa_guidelines_2017.pdfIn PDF document text
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/4fc7b468882.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/zedunaraziwavobezus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_af7976359067438b9a353345be0737b8.pdf?index=trueIn PDF document text
    • http://mexexumekevuk.rf.gd/auto_frisian_dew_grow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/finenazeworafutoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/68631549298.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_bafe44403d02467b83326473a6477a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/jezaxemutusobok.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_a4840d6dd9ab4174873e237810df5d14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/best_no_root_android_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/alight_motion_pro_2._5._1.pdfIn PDF document text
    • http://vofumutuziwuka.rf.gd/arcon_normal_font_free.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_4c7f9ace35a843abae25820d813b81d7.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_cb94f64d11e74dd78e825899d39adfb8.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_9a4483fd13e944b5bb166264cf3ece3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/andy_offline_installer_32_bit_free.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_25c2dc68e535456b925278cdb00bcc62.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_8d826fc9c6e34687aaa01ce2d438a745.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/jivatibatubuvopuxedu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 28880 bytes
SHA-256: f8b5ecdd99fc5c4760929127996b22eeec90336d4662b19ae73bdbbab5a3fe9d
font_01_sfnt_off0001475b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475B 6068 bytes
SHA-256: 349784f50421deb2ed2125a76da57268347e752f031605a43c4356e4bb716bd8
font_02_sfnt_off00015c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C03 11512 bytes
SHA-256: e501a5bc0882ce616f9c5ae6a9adda164d92539d8736d0f90d84016254ebbe5e

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