Malicious PDF — malware analysis report

Static analysis result for SHA-256 7621f88433f37b0c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 15:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b928696995a62d00499fe86ec559884 SHA-1: 211b809a02cbd3e0d85042b6bdb5043ac3250977 SHA-256: 7621f88433f37b0c959cb68dfa525e2b4eb18fdc7b4c1f0e3176c397be508dd2
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=free+math+worksheets+for+grade+4-+patterns PDF link annotation
    • http://lumufurisazela.mywebcommunity.org/rinnai_ruc80i_error_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/huDXxji/anger_management_books_best.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_6018792317312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5ffc760acd8fc.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/ihihhif/cross_fight_undertale.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/kaxilu.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/autocad_lt_for_mac_2019_system_requirements.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_603e3bc12030f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fe35920d6f9c.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/Pgehecr/47685403188.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/dic5hfl/tediputajurife.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/Pejhhdh/92351866003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_6049b48555241.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/solve_math_problems_alarm_clock_app.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/maytag_quiet_series_100_dishwasher_racks.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/autosuggestion_techniques.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dofufiri/wilimamumaxatutiban.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/pet_sematary_original_cast_gage.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/francisco_vazquez_de_coronado_timeline_of_important_events_in_your_life.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/92478063043.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/86545358959.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/xuvunefipi.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/jogifufezefaka.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/maxokivuxamovexelos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5652 bytes
SHA-256: 423d0bf48564bc64c85d4da3fb5fbb873bd0716dc0ec1249ffd7e40f6e838e2b
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10284 bytes
SHA-256: 7a9e7a2c361afd5ad9cf05f14a66e8225e82a220089b7f8a948f47dbab41b7ae

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