Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a7951c33571620…

MALICIOUS

PDF

81.8 KB Created: 2021-03-27 18:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e707257686a9d66e61f4c512d9fb5789 SHA-1: 943259c806f7e4f52d968cd421f67005a27cd77f SHA-256: 15a7951c3357162099bf2e68e642c5f84cfe26628bcf2a1087d78f76f9f938b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs with numeric or generic slugs, indicating a link farm. One of the primary links points to a URL that is part of this farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=perimeter+and+area+of+triangles+worksheet+answers
    • https://cdn.sqhk.co/rubalibuzodi/ibggii7/xetesexunebolexulapukepi.pdf
    • https://cdn.sqhk.co/zadexona/T47hhzN/recipe_for_sugar_cubes_for_horses.pdf
    • https://cdn.sqhk.co/tenalewi/hjehjih/lilive.pdf
    • https://cdn.sqhk.co/fazituku/bgfidzH/zekodibaroruwuvifapi.pdf
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/pajuxabobij_lolopi_tixol.pdf
    • https://bujubisagakib.weebly.com/uploads/1/3/4/3/134323903/luzelebivafovene.pdf
    • https://wovuposekase.weebly.com/uploads/1/3/4/6/134613379/6448925.pdf
    • http://zuxenegobepejij.22web.org/xokafo.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fd60cb947f42.pdf
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/9c6cb.pdf
    • http://zavupefedeba.22web.org/tozere.pdf
    • http://moxufelomewiziw.iblogger.org/56966747726.pdf
    • https://cdn.sqhk.co/fusojafiza/xidrCNI/39248972945.pdf
    • https://cdn.sqhk.co/doburazax/eB4Nvja/easy_cursive_handwriting_worksheets.pdf
    • https://cdn-cms.f-static.net/uploads/4461207/normal_600a5374ae99c.pdf
    • https://cdn-cms.f-static.net/uploads/4413866/normal_603eeae47069b.pdf
    • https://cdn.sqhk.co/wubumeze/ibL6Qii/nuduluxeraretagaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4493876/normal_60522490cbdc4.pdf
    • https://ruzejome.weebly.com/uploads/1/3/2/6/132681971/ace90e41e15de3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gapuruxumeg/bapurimulu.pdf
    • https://s3.amazonaws.com/fogibi/gdpr_privacy_policy_statement_template.pdf
    • https://s3.amazonaws.com/batoragubukepo/new_arabic_song_2017_free.pdf
    • https://s3.amazonaws.com/purixifusipelid/74635350395.pdf
    • https://s3.amazonaws.com/dutimajizowa/wabikotixinig.pdf
    • http://sadorebudinazu.epizy.com/vujunulelo.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_off0000ecb3.bin
33b40263ee9aec909b630ee1dcd7895445fb81f09388c823e69e14e6044a7883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5476 bytes
font_01_sfnt_off0000ff3d.bin
9c34e3c1300951111df23988f40af9ad17d101b718d2a19af31ac528d82be3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10712 bytes
font_02_sfnt_off00012441.bin
d12ffaa940c15d24e471729ee5567d21a88133c29a2466b1fcf75c36d091922f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16196 bytes

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