Malicious PDF — malware analysis report

Static analysis result for SHA-256 89903658a3dfc84f…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 21:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd9f986fa83fbb1656ce30a10c1d9e6 SHA-1: 57b37c55ce1d48f9e3ab772444c7012eccf1e390 SHA-256: 89903658a3dfc84f2c9dcdbc9b53d84e422781dc6254fd88b6588b2780fb03b0
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'vilenefex.ru', which is likely the primary malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=what+is+a+computer+engineer+do
    • http://trydouche.xyz/garmin_430w_update_subscription5a81r.pdf
    • https://cdn.sqhk.co/sexipemajim/gfajh3S/siriruvi.pdf
    • http://inostrana.com/how_to_update_modem_firmware_motorolanu4a5.pdf
    • http://gebuhrenfrei-mein.com/what_is_relationship_between_china_and_taiwanah1wr.pdf
    • http://pekibimige.mygamesonline.org/13003985165.pdf
    • https://cdn.sqhk.co/novupezezis/3hfnjcN/57458140077.pdf
    • http://xokebidukefu.getenjoyment.net/cardboard_car_template.pdf
    • https://cdn.sqhk.co/fezavomol/dhclhiS/kpop_vocal_analysis_female_idol_vocal_ranking_chart.pdf
    • http://it50disconto.pro/heartworm_treatment_guidelines_dogsk0jtt.pdf
    • https://cdn.sqhk.co/zapusukajev/jfhgdii/nasal_cannula_fio2_range.pdf
    • http://boothattendant.com/49513683298tkb3e.pdf
    • https://cdn.sqhk.co/govamopega/Ejdidgi/desire_of_ages_study_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fewifuwu/mijapixuwu.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_e251ae8174874c7b878a1399eb5d5c2c.pdf?index=true
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_b73aa7ec227a42d989016dea09eb953b.pdf?index=true
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_f59e78ed29b245c78c96643b903bdd3e.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_3b0d22e8e72d45bb8db97c1f8fc49e51.pdf?index=true
    • https://s3.amazonaws.com/kezemiradigu/dd_monster_handbook_5e.pdf
    • https://s3.amazonaws.com/dogazisuze/fuxuretomelamapavifuzodaw.pdf
    • https://s3.amazonaws.com/remuv/51104355814.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c7.bin
d5f07c6209ae1a9e6f1e922e36c4a001e6c378853023c58444f6cdce5922dd5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 5352 bytes
font_01_sfnt_off0000f8ce.bin
00b20c4bf022536ba9dcef7eb57bcb97055f6a87007b27135b3aa32a20385015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 11012 bytes
font_02_sfnt_off00011e79.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 4324 bytes

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