Malicious PDF — malware analysis report

Static analysis result for SHA-256 55de9951ea813b07…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 13:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb749b3cc922d022e8f2a77f2e63f75 SHA-1: 70a0d193b64567d454bc7757f69619ac40e4a76b SHA-256: 55de9951ea813b0757c33493a5a22866b4e3374dfc9477400b159b5df3c358f5
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains keywords related to a textbook, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://resalured.ru/award?keyword=holt+sociology+textbook+pdf
    • https://cdn.sqhk.co/jabosuve/gjihkja/nefalo.pdf
    • http://xumupizaxuto.scienceontheweb.net/suzosifuwezowa.pdf
    • http://budofibo.mygamesonline.org/java_swing_gui_programming.pdf
    • https://cdn.sqhk.co/dolitife/tjeigiB/cartoon_wars_3_hack_2019.pdf
    • http://ita-yog.space/asset_based_information_security_risk_assessment3n2zk.pdf
    • http://productwood.ru/manual_control_universal_rca_systemlink_4wbsmu.pdf
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/nosutovikugejopojak.pdf
    • http://xotizel.iblogger.org/synonym_for_formal_request.pdf
    • http://rusakadovub.sportsontheweb.net/27763518990.pdf
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/makoxawata_jagunoza_loxizanapulud.pdf
    • http://tufuwavaziga.mygamesonline.org/shop-vac_5-gallon_2.0_peak_hp_vacuum_manual.pdf
    • https://cdn.sqhk.co/mekaxosur/hgebMZv/youtube_to_mp3_android_app.pdf
    • http://artyom.guru/sazifabotugudomoffnbj7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_ad39e7fd01a24798a8bdcb79bc7c157e.pdf?index=true
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_2581199ca3ad4076ac605eca237e05a3.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_0c4829b1d37c45ed81b3d37ed8aca5b0.pdf?index=true
    • http://renureva.epizy.com/kafogidunokibaxafomi.pdf
    • http://savuxerekeze.epizy.com/burimadikununubiminito.pdf
    • http://likutolejit.onlinewebshop.net/wix_oil_filter_for_2007_honda_civic.pdf
    • http://gofapebilim.rf.gd/58210171231.pdf
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_4903a0c903e34dc985974a056497513f.pdf?index=true
    • http://dogirajuwuxo.epizy.com/napawumesomuravaxezizu.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_off0000cad0.bin
a74d660f1da3567532dd7ee4c2032c7c8b023807dbd128a076c20452a899a616		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 5352 bytes
font_01_sfnt_off0000dd28.bin
1d08f13103eef4ee2865f7a3a3e8a2ec743e9b6f3a67f58548cb2f0d8e028c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 10644 bytes
font_02_sfnt_off000101d5.bin
3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 16084 bytes

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