Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d9e049469818ac…

MALICIOUS

PDF

101.9 KB Created: 2021-03-11 04:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 671a1c7e990ee1ea28cb0860839c5300 SHA-1: 7efa8a691c8f69d49a7b3340e3415e57c6d3f315 SHA-256: 40d9e049469818ac4ac34151146231a1400b8615250078d4316a6b399442bfc6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with the primary one being https://jacksth.ru/award?keyword=capital+adequacy+ratio+basel+3+pdf, suggesting a phishing or credential harvesting attempt. The PDF structure itself shows signs of manipulation, including duplicate object bodies, which is a common tactic in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/award?keyword=capital+adequacy+ratio+basel+3+pdf
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/7742096.pdf
    • http://xufuxenu.mypressonline.com/bibene.pdf
    • http://sunazeremitiwu.mypressonline.com/how_to_pass_step_3_ccs.pdf
    • http://gemubanabugawa.mypressonline.com/adobe_illustrator_cc_2020_tutorials_for_beginners.pdf
    • https://mateboxabivof.weebly.com/uploads/1/3/4/7/134763458/vudewudit_forisoposida_sunurajagan_levoda.pdf
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6044f7d7aa8bd.pdf
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fd10fa1091b7.pdf
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fe51d5b31cad.pdf
    • https://nuxajitavira.weebly.com/uploads/1/3/1/8/131871558/f88dc10b86544a2.pdf
    • http://pakekoramiduwin.getenjoyment.net/places_that_give_free_breakfast_on_your_birthday.pdf
    • http://fapasevusiledap.mygamesonline.org/sovelewojopufiz.pdf
    • http://dusibarupuguli.medianewsonline.com/16988706062.pdf
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6017c126bdb4d.pdf
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603febf761b34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d0c824e-2e55-4de6-bb11-ed6696fd8a82/wuzope.pdf
    • http://vunonam.atwebpages.com/what_is_complex_trauma_in_mental_health.pdf
    • http://wuwedilejom.myartsonline.com/xuguwojanifobenafuf.pdf
    • https://uploads.strikinglycdn.com/files/e6a34839-ad1e-4953-b546-0d7530de8a11/tesokajilexeriv.pdf
    • https://uploads.strikinglycdn.com/files/9ade00d6-b639-4cf4-b7e7-69335b22c067/gizadegiwiradekarokudi.pdf
    • https://uploads.strikinglycdn.com/files/20f42bcf-f376-4954-aa20-71f4ab6caea1/cuanto_es_el_salario_minimo_en_mexico_al_mes.pdf
    • http://nazowovemozugiv.myartsonline.com/wibakeduvimowiwolujozim.pdf
    • http://pebomotixot.myartsonline.com/miss_peregrine_home_for_peculiar_movie_stream_online.pdf
    • https://uploads.strikinglycdn.com/files/27576aea-ff31-49c6-b76c-ad0c825043ad/rheem_tankless_water_heater_troubleshooting_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f88.bin
4399a3e7e8eb6bdea772122e04018d33026baf19b5506b07ac6d35aa2c61cfb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 5584 bytes
font_01_sfnt_off0001628e.bin
45abe240a795980079a13cda9ea908edc472d873bb8591b1f15806ae53b9455f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1628E 11504 bytes

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