Malicious PDF — malware analysis report

Static analysis result for SHA-256 744ca8c3ecdad391…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 01:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a115e640d5652504e1ec62e405f8799 SHA-1: 7851f9feaef9a17d441421bff6acc4815e20efbd SHA-256: 744ca8c3ecdad391c525cf89e87f92036093b9b99a45bc93a1f1fc6029d50060
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'vilenefex.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'fishing report'. No scripts were extracted, but the presence of external URIs and the overall classification strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/123?utm_term=lake+ontario+salmon+fishing+report
    • https://cdn-cms.f-static.net/uploads/4366313/normal_6031f6b08549f.pdf
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6031f7852d1e5.pdf
    • https://cdn.sqhk.co/melipetoluf/Piavlgi/papibupatuvupovaw.pdf
    • https://static.s123-cdn-static.com/uploads/4443329/normal_6008722c7d581.pdf
    • https://cdn.sqhk.co/tememagitapo/jfbgggi/zisovaxifubigozof.pdf
    • https://static.s123-cdn-static.com/uploads/4366032/normal_60075542691ed.pdf
    • https://cdn.sqhk.co/nomuzali/ijcmcqR/ubereats_driver_application_process.pdf
    • https://cdn-cms.f-static.net/uploads/4380528/normal_6061df85e3742.pdf
    • http://modarab.mygamesonline.org/descargar_diccionario_biblico_ilustrado_gratis_en.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zafirawit/hp_deskjet_2545_wifi_connect.pdf
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_35a96c341d824911be793f5236895956.pdf?index=true
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_8d3df0c087e74d94a4f4a92118bee4f2.pdf?index=true
    • http://valupakukav.myartsonline.com/broncho_vaxom_sache_bula.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_dc3ec82bada8455a999779e168e8ce7f.pdf?index=true
    • http://palelezugob.onlinewebshop.net/donufupavidikudikedu.pdf
    • https://s3.amazonaws.com/lebaxa/hierarchicaldatatemplate_wpf_expander.pdf
    • https://s3.amazonaws.com/vexosafugunu/us_passport_re-_application_form_ds-_5504.pdf
    • http://nabulegewuwal.myartsonline.com/xopenefitovenejirareveb.pdf
    • http://wesawujejo.epizy.com/2014_lexus_gx_460_wheel_specs.pdf
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_39986c796b7f4698853fa64f0f817bc4.pdf?index=true
    • http://xapedizidelixov.epizy.com/rurixafofizupobikipak.pdf
    • https://s3.amazonaws.com/lofese/unable_to_unhide_sheets_in_excel_2016.pdf
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_8860d1df4c7b451a8840bdb9a89d8868.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_off0000f171.bin
e90ca391c12b67596842efb161779bc70acb14083c56d37ae31af592585260f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 5320 bytes
font_01_sfnt_off0001036c.bin
138e0bf82eaf9c0b4d22cc3cd20a9007555297712a59221812877832f706f689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10476 bytes

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