Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfb2f82edaacd05…

MALICIOUS

PDF

75.8 KB Created: 2021-02-20 01:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 864550cd664bf5e786bb9dfc5f3da083 SHA-1: ceea68f24e512af6518df5a1e0fdb7ffe30d7764 SHA-256: bbfb2f82edaacd052a3e30fc1eacd9794b9a1da5bfd893d743f364bdd423de9e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://druttle.ru/wix?keyword=earth+science+lab+mineral+physical+properties+and+identification+answers', suggests a lure to a website disguised as educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=earth+science+lab+mineral+physical+properties+and+identification+answers PDF link annotation
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/mudenevuxagifize.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/VLurMhi/96115519754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fe74d87c56d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5fee862393c37.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/gfghhf8/vikings_ii_game.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/elv4jdx/pocket_option_broker_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/7igz0jg/technology_education_certification_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/6qG9PnP/x_wolf_supplement.pdfIn PDF document text
    • http://dimukidiri.iblogger.org/seja_alta_performance_fortaleza.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/gfjdCii/diwuzikoserirojasoxepak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vomoguzidazufi.rf.gd/chinta_ta_chita_chita_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/kipemej.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/midekikinezutix.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/eureka_math_answer_key_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/79519957107.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/risaxameluduwotizemox.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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 5472 bytes
SHA-256: cebf65f234b76626474a9086af4ad36d92f7c7bca67c4ca86cd3ae17483c0caf
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10348 bytes
SHA-256: 428e2fa1249f18966d6b6142cd0f1b0bb5214a2473295140b623f81a2ad6ed17
font_02_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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