Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a5942de7b722fc…

MALICIOUS

PDF

89.2 KB Created: 2021-03-22 22:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f9c088e867b6c9cfc0965cd5315738b SHA-1: 7beef2d1b68d65b4784f77384711697f61997b2d SHA-256: 17a5942de7b722fcfbdc9d28b26830e76a8d1d3b333f6c3ca89ada689fc88abb
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to other PDFs, suggesting a phishing or SEO spam campaign. The primary URL, https://vilenefex.ru/award?keyword=tutorial+tablas+dinamicas+excel+2020+pdf, is presented as a tutorial for Excel, likely a lure to direct users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=tutorial+tablas+dinamicas+excel+2020+pdf
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/60341d63102b7ff.pdf
    • http://magarunu.iblogger.org/biwikowiragaloz.pdf
    • https://sesoguxanijiba.weebly.com/uploads/1/3/5/3/135309487/8ab466c.pdf
    • http://vasetar.iblogger.org/red_rising_game.pdf
    • http://kopumiwabetare.66ghz.com/answer_key_neet_2019_p1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pavefobigemaxe.rf.gd/jual_avanza_2010_type_g_manual.pdf
    • http://lakugarim.rf.gd/d_d_alchemist_class_5e.pdf
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_63582529a9d6462398851057f16e22f3.pdf?index=true
    • https://s3.amazonaws.com/kewakuko/lorubedekavidagugulorolas.pdf
    • https://s3.amazonaws.com/nezanurugega/vawiberadurepeb.pdf
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_764a5bda8b3a496898881bb38c32c0e8.pdf?index=true
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_f7daecc629524ce0a2ccc8fdb5187ff0.pdf?index=true
    • http://sadesepipo.rf.gd/maths_olympiad_books_for_class_5_free_download.pdf
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_e8c425c4b3c742eea041d7adc75198ae.pdf?index=true
    • https://1f7d5645-f7ff-4e8a-adf1-68ee3026c1e2.filesusr.com/ugd/54fa57_f7d027d0f12f4a2aa955f5b474d07804.pdf?index=true
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_78286174226a4250b03266fdd3981469.pdf?index=true
    • https://s3.amazonaws.com/bejexe/demerifilanamupobite.pdf
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_e450c4bc3c634a03bb9cc467aee182b2.pdf?index=true
    • http://talagamezibupip.epizy.com/45778793532.pdf
    • http://dadivudibe.epizy.com/97722120236.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001036f.bin
e3aed0f5e98e7c6297a9fa21700b5198077c405468da03fa0e6909f542bdb787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 5732 bytes
font_01_sfnt_off000116da.bin
7079705e4f64a98443632660a1b5bdc40faeea7920c4aa4d1c92ef6891310611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 12488 bytes
font_02_sfnt_off00013f73.bin
c00fbf3a7d0a292ceb1fd87798d767051a69bd4df541178cbdbeeb887239830a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 16240 bytes

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