Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3a0cdb7844febd…

MALICIOUS

PDF

140.8 KB Created: 2021-03-22 10:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 198f8827d666ca8d021c0a21ca08e6a6 SHA-1: f62bd80ce003fc9cc28a9e4791ba804deebed964 SHA-256: 2a3a0cdb7844febd6045579fa04dfe82c7aface1366427a1d1349ffc075733e9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=the+design+of+everyday+things+2016+pdf PDF link annotation
    • http://fewemika.66ghz.com/8553649339.pdfIn PDF document text
    • http://vadememejunozax.iblogger.org/asfixia_libro_gratis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369316/normal_5ffe25f29c9a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_603e3dea0a025.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/how_does_the_education_system_reproduce_social_inequality.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5ff1f3c83feca.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/bopar.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/38848d53-1edd-4a92-89ac-aaad190da705/domain_and_range_worksheet_answers_key_precalculus.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/kijimikixajoluketeb.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/kofikuremakexujirurera.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/salary_of_acca_in_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/lakoj.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_bbeca9b9cff04440858ab6f267e7b305.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_e3ba66435a7d497487d2a527c6c96150.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba88d5a8-9d85-49a1-bc04-c0b25ba1f004/58591128313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5e06dd-205f-4c15-a9ad-e21d5594c5c2/lakalepolije.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/what_is_the_role_of_religion_in_modern_society.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/raxepibewizutibugolel.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_1c6b4079f6194ffd9da5620e159675d1.pdf?index=trueIn PDF document text
    • http://genolewedusu.myartsonline.com/root_cause_analysis_techniques.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_off0001e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E749 5864 bytes
SHA-256: 98bae24ec5385a1a6b6ef7357590e21a1b1b7d429aa7a681fb098688bec9bdf6
font_01_sfnt_off0001fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB44 14784 bytes
SHA-256: 26fd92280323c336117f4f52c8b15635ba09b51c04b25c9e8118e8c4a59aee5a

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