Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9efc9fae1ad84c…

MALICIOUS

PDF

72.6 KB Created: 2021-03-28 08:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 436c4d39a6adce37644ccc49fbcb5b64 SHA-1: 7b188d92d2f275d8ec6790e90687afcecdf9a821 SHA-256: ae9efc9fae1ad84c963796b6ec7ea584bc7350a40d85f52d2f7e5cacb8cb95e8
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xajibur.ru/award?keyword=statistical+rethinking+solutions+pdf
    • http://bathforlegs.xyz/bujomenefoledizewabnilp.pdf
    • http://duwudivusupo.mygamesonline.org/56415981146.pdf
    • http://vuvajujuli.mygamesonline.org/makalah_konsep_dasar_akuntansi_manajemen.pdf
    • http://vizilirudigub.getenjoyment.net/44732209765.pdf
    • http://xazonojader.mywebcommunity.org/comment_tracer_le_cercle_trigonomtrique.pdf
    • http://begemotiks.space/81774276240sbhrt.pdf
    • http://tuduvodakep.mypressonline.com/terufesix.pdf
    • http://tefuvawilutir.mypressonline.com/transport_business_proposal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vagilamiporaw.epizy.com/symbolab_pro_apk_5._2._1.pdf
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_94e6af9c2f5e42d295ae2cc87214e39c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20bf9c19-f82e-4f8b-a722-aec2e18e97ee/xakedanagowafimarigikik.pdf
    • http://lotuseposan.epizy.com/39628298303.pdf
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_c226bed399c74ce8981d10d86ee74c52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/412941ac-171c-4bc8-ad80-16bc82c1b966/the_coldest_city_graphic_novel.pdf
    • http://gogujigasad.onlinewebshop.net/sample_essay_outline_mla_format.pdf
    • https://uploads.strikinglycdn.com/files/f4793be1-f827-4cda-9afa-b79eeb72ec98/kunesamin.pdf
    • https://uploads.strikinglycdn.com/files/02700637-1d74-40f2-b477-45f567a4d78c/61609540946.pdf
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ffe668580d494a30b822e17cb1813c2f.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_off0000db51.bin
9e16623724b76709d2b797ad4584fec4dbedcaf7603ca15b0f49311889e6959f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5584 bytes
font_01_sfnt_off0000ee44.bin
898f8b7936b415b3b695f28a82e745cd31e80313d931cece97b5a963f17753ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 11532 bytes

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