Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1be6f5a12a943d4…

MALICIOUS

PDF

71.8 KB Created: 2021-03-22 06:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6678acefb7554b3be34276781b522c SHA-1: 5742c1bf9c326437ddfb2cf55a1888abfbdc1679 SHA-256: e1be6f5a12a943d41b51f25dda129a772ed6cc74d71819d500035bb46e62a161
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 'zajinet.ru', which is likely a malicious domain used to host or redirect to a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'Kumon math worksheets grade 3', indicating a social engineering tactic to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=kumon+math+worksheets+grade+3
    • https://cdn.sqhk.co/bamazaludez/tlXEhbV/xefiviwolowasodanu.pdf
    • https://cdn.sqhk.co/gabadifofibo/OjjDfhf/60416846985.pdf
    • http://ueuniti.xyz/wejujogafifugosunua7oh6.pdf
    • https://cdn.sqhk.co/kefaforuletu/12WJqjb/49343410772.pdf
    • https://cdn-cms.f-static.net/uploads/4419235/normal_60387bc43b5db.pdf
    • https://cdn.sqhk.co/gefisodir/ijdoghk/66042447133.pdf
    • https://cdn.sqhk.co/xifusajexom/kr8yZhi/ravens_schedule_2020_printable.pdf
    • https://cdn-cms.f-static.net/uploads/4402032/normal_602a536299787.pdf
    • http://opensalon.xyz/44450437875cfqse.pdf
    • https://static.s123-cdn-static.com/uploads/4499635/normal_60059afce1ef1.pdf
    • https://cdn.sqhk.co/mixubiki/jv0Yaja/does_frndly_tv_have_hallmark_christmas_movies.pdf
    • http://logoped-samara.ru/2007_honda_civic_reset_oil_lighthrfsu.pdf
    • https://cdn-cms.f-static.net/uploads/4481539/normal_5fe98a9c213c1.pdf
    • https://cdn.sqhk.co/naxupowu/MSgd5NT/netflix_party_not_working_invalid_session_id.pdf
    • http://idealicagocce.site/how_to_install_a_honeywell_thermostat_youtubeqx6bp.pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_6028feae2954f.pdf
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fc7d12984f82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_5e72203d23be461a9f6327d927dd8751.pdf?index=true
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_26065968952c4482b4f94680253a291d.pdf?index=true
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_6ff8207223704207be7e5c561598d0c5.pdf?index=true
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_64ad204931af4293b90499a6849ed920.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_off0000da41.bin
113981f039a42bde872d897fbc00e33a84ccf8b948b93725d52ada0e677c8b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 5496 bytes
font_01_sfnt_off0000ecdd.bin
6c88403e0e02fc6056dfea2e9446479e6cb784a62cfbfe8d48098e67aaa7142b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10808 bytes

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