Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f65c8dd84f3228…

MALICIOUS

PDF

68.0 KB Created: 2020-12-01 13:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c4db19659f03ca78acaca38c45cf2bac SHA-1: 183f5b3bb1c3066a4cf41dc9c93533a990bc21a5 SHA-256: 77f65c8dd84f32283bc60d4840bfa1e3b803a98c8cf8f8df4df18372255b1108
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers'. No scripts were extracted, but the presence of an external URI and the overall malicious verdict strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=what+gives+you+the+right+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5fc3479a5e0a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_5fac46c0a8a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fc0cad1ede07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fca7052-3e02-46fa-9014-24b36f99c406/chair_yoga_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0339a5ba-6568-4cc1-bb88-72edcaf8c8ef/givuweviviwizijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11de733f-b54c-41cf-ad7d-e23e5de7fe42/83532874903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b459ca-09fd-41ec-9bda-ee0d710a9538/hamilton_county_auditor_org.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b60b6f1-5c6b-48ba-bb89-028aaf1eac28/dafavo.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/14331717163.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/pobenigafanatutefokema.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/xopixezatarezil.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/17302265832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a9f6a1-d991-41ee-a8a8-43fd8ebe5d76/japalodajimagek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2bade6d49a06bb5b5b09/1606298543605/how_to_make_foldables_for_science.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/formula_da_resistencia_eletrica.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1c3643516d6aa83e0ca2/1606229049253/sasufikuremob.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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 5244 bytes
SHA-256: 396462381691a7a4c721915ea0344b6a516ddf91b464709d5e2c2f6bdaf32cc8
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 10480 bytes
SHA-256: f1f193640dec15b9b71a2ae8b6c794555df6466b4af96da52fbd8196253fb46d

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