Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e44e16a767133a2…

MALICIOUS

PDF

66.2 KB Created: 2020-11-10 00:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 386967311179f657fd6ec1564d8cedf8 SHA-1: 1506f10e5dffc069e2b18eab7f7ae30a4e66aa54 SHA-256: 6e44e16a767133a2fde0e5c3e70fde4f5bcc76cc9902344eb5f9b5178106c4f5
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 high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting it is an 'internship acceptance letter example', likely a lure to trick users into clicking the embedded malicious URL. No scripts were extracted, but the PDF structure itself contains an external URI pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?keyword=internship+acceptance+letter+example
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f895e973f4cf.pdf
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/ade4b10bd59a3.pdf
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/kovoxigelig.pdf
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/kidumo_vuporikoz.pdf
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/f9576e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regegozumekoza/pezizikipi.pdf
    • https://s3.amazonaws.com/taturi/constitution_crossword_puzzle_answers_49a.pdf
    • https://s3.amazonaws.com/tetazino/bodirunamipoxu.pdf
    • https://s3.amazonaws.com/tulosa/zudivusik.pdf
    • https://s3.amazonaws.com/henghuili-files2/best_reader_for_ipad_2.pdf
    • https://s3.amazonaws.com/sakaburepagase/bakutulalulerilikuwavaw.pdf
    • https://s3.amazonaws.com/xedewofuretujo/never_eat_alone_keith_ferrazzi.pdf
    • 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_off0000c681.bin
a4b260bba2e03f7cccbec164bff211e2fdef3e2a478cf1f6a74f8e65e9f517bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 5176 bytes
font_01_sfnt_off0000d7f6.bin
37f2599b1fa423a4bd19f87c7c24867fd93e238b66fe9d3ef31be4f70271e0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 10564 bytes

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