Malicious PDF — malware analysis report

Static analysis result for SHA-256 4867b958beed53fe…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 15:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4942a035cd57ca17a29bfc6a7b4eb57 SHA-1: 66c85dd018c5e605e066b322d1eac1bac6002ede SHA-256: 4867b958beed53fe29fe9a602b9f831cd8d448d8a761d5527c94e53407e51995
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to educational worksheets. The presence of PDF-specific heuristics and embedded URLs indicates an attempt to deliver malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=acid+bases+and+salts+class+7+worksheet+pdf
    • http://domainlimax.xyz/10922194842yw0se.pdf
    • http://nokasosozigof.mypressonline.com/causes_of_flood_in_kerala.pdf
    • http://suberubepuparo.getenjoyment.net/48185397398.pdf
    • http://mosomupusafebin.medianewsonline.com/nonekuzani.pdf
    • https://static.s123-cdn-static.com/uploads/4401691/normal_5fcc29453bb37.pdf
    • https://cdn.sqhk.co/keviwebewuta/hgkhcwp/99717342239.pdf
    • https://cdn-cms.f-static.net/uploads/4477916/normal_5fd34d5b245a4.pdf
    • http://peuly.xyz/who_is_the_best_classical_guitarist_in_the_worldnclgd.pdf
    • https://cdn-cms.f-static.net/uploads/4426695/normal_602d3f4cde7b0.pdf
    • http://bitoxifa.sportsontheweb.net/what_lexile_should_a_3rd_grader_have.pdf
    • https://cdn.sqhk.co/malofavu/boeCNia/97675360799.pdf
    • https://cdn-cms.f-static.net/uploads/4443608/normal_60176be946bbd.pdf
    • https://cdn.sqhk.co/numobelez/igibjci/73888644801.pdf
    • http://pakunobun.getenjoyment.net/international_business_strategy_theory_and_practice.pdf
    • https://cdn-cms.f-static.net/uploads/4421218/normal_605c13ddf1319.pdf
    • http://spainsale.pro/75626423094g6vzn.pdf
    • http://bulibujirifubof.scienceontheweb.net/ganpati_atharvashirsha_lyrics.pdf
    • http://golixudib.mypressonline.com/construction_fire_safety_manager_jobs_nyc.pdf
    • http://thestablestl.com/dulomazanixsx9i0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_ddc403059eb240f388403cc13a70caae.pdf?index=true
    • http://retiziwo.myartsonline.com/pojox.pdf
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_cb9e39945d9b4e6088ff099d20b83d2b.pdf?index=true
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_90d932514a634ee1be28166fec3e7fee.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_off0000e759.bin
9cee604cfbdaa002d75010de7b48f4af7fda37561993812be6eec9fdab5ea9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 5608 bytes
font_01_sfnt_off0000fa7b.bin
c78440025bcb39201d6bedac610c732c2e1ef4148b4835e4835520581e7009b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 10724 bytes

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