Malicious PDF — malware analysis report

Static analysis result for SHA-256 374c8806f75676ca…

MALICIOUS

PDF

73.4 KB Created: 2021-03-25 02:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c244c070b8527c2232d778a8ac8f8fe SHA-1: d8c943edaf062b9ab0d67c01969dc1c76b39d8ad SHA-256: 374c8806f75676caeb7255a211f547041dd229f5038e4560b2df524f19fd041e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick the user into installing a browser extension or update. The embedded URL points to a domain associated with phishing lures, suggesting a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maypoin.ru/wix?keyword=thomas+multivariable+calculus+solution+manual
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5ff759682cec1.pdf
    • https://tifefosejamixin.weebly.com/uploads/1/3/4/3/134370351/0d4d0.pdf
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/jiver.pdf
    • https://cdn-cms.f-static.net/uploads/4490256/normal_602d0c19b548d.pdf
    • https://padikolejak.weebly.com/uploads/1/3/4/0/134042397/zikisakesijox.pdf
    • https://xumuxurubaxuk.weebly.com/uploads/1/3/4/5/134501003/jupopetumuxir_gariwutewezu_vikor_lezedaxunige.pdf
    • http://jonotijero.medianewsonline.com/xivubawasagafuwodatofen.pdf
    • https://cdn-cms.f-static.net/uploads/4460446/normal_601c8db9d0565.pdf
    • https://gimegeje.weebly.com/uploads/1/3/0/8/130873822/jijofoxa-fewonilejibuv-neluxedigavu.pdf
    • http://jasazotinalol.mygamesonline.org/31834161063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb2a0ada-061a-42b4-97fa-0c5c99beb7c5/tijokubevoz.pdf
    • https://uploads.strikinglycdn.com/files/807d332d-78b7-471f-aa66-01cd49a8eea3/nisirojax.pdf
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_a1e52f046f1447f883493e45700ef436.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5d0c2dfb-007e-4e76-9a47-b1c127b5287b/13297164404.pdf
    • http://nivuzujanux.myartsonline.com/definition_of_developmental_delay.pdf
    • https://s3.amazonaws.com/wazagidonux/tubim.pdf
    • http://solugivewatewa.myartsonline.com/42012495562.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/wanogigegadidu.pdf
    • https://uploads.strikinglycdn.com/files/9dc23227-1db9-4499-980f-0e97de78fced/nezozaropewemukikamapuxe.pdf
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_350fc45e94ea480d8932554f3de98907.pdf?index=true
    • https://uploads.strikinglycdn.com/files/336f161d-0b7b-4a49-8741-e3158d0462f4/what_is_environmental_impact_assessment_eia.pdf
    • http://tiwatimab.atwebpages.com/36593495197.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_1411ec39d11d4bc6bbce68d4e9cdcbd5.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_off0000deeb.bin
3680ed9d90523b6ec6c4debf13f6834b236b0996945bf8b2622919a9f6c7859e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5188 bytes
font_01_sfnt_off0000f068.bin
46ff943bbf8e9fa973677b27ce9250d4603e6a0c29c93dd1c2d32cb92a96811f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 11424 bytes

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