Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffe1c27cb8c3ce7…

MALICIOUS

PDF

96.3 KB Created: 2021-02-15 16:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3e1d11ca2ffb963f823fcc00573f9389 SHA-1: cd74b86bdde45a7c20ab0d659c9535c3eaec10ce SHA-256: dffe1c27cb8c3ce77fdf053b9f3a8e5e7190f15cfa145c7b09a2d221a3f33e79
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to "Mandarin pinyin chart pdf", likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the presence of a malicious URI and the ML classifier's high confidence indicate a phishing attempt.

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://jacksth.ru/strik?utm_term=mandarin+pinyin+chart+pdf PDF link annotation
    • http://thehensleys.org/libros_para_aprender_ingles_con_audioikntq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469834/normal_6007149a46f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6010c71ea25bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_601153cb07045.pdfIn PDF document text
    • http://cuzinfo.ru/xemukemudixukozi6np75.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/ziwuvijevo/h_and_m_size_guide_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/messenger_cleaner_extension.pdfIn PDF document text
    • http://pebenuxotuk.epizy.com/c_function_template_specialization_vs_overloading.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/ielts_discussion_essay_sample_answer.pdfIn PDF document text
    • http://xivobotaxonid.epizy.com/gamafo.pdfIn PDF document text
    • http://wasuwenakab.epizy.com/baraat_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/7738365454.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/xedepesulenilepuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/os_axiomas_de_zurique.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/kenexa_proveit_test_answers_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/54814155725.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/79871401574.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 8924 bytes
SHA-256: f90b1ca5d6bf812649f2c0daf77d8f074c598e651f1ef47be56768f735453915
font_01_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 5140 bytes
SHA-256: 82dab4fef2b5d6df3d9b83d59bc4e3e810badb1e9420c42f192d12c6a32bc27d
font_02_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 13548 bytes
SHA-256: 4b30f045183c0d8c2f856b77a46cc48e5374a33806b02231ddf5cd795fcadeb6
font_03_sfnt_off00015e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E21 16244 bytes
SHA-256: dc743b41e5c9b9e4d56ad8c22d1311c6eb3cecbc0d04401a7a33aeed2fa7944a

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