Malicious PDF — malware analysis report

Static analysis result for SHA-256 635de42fa52babab…

MALICIOUS

PDF

78.5 KB Created: 2021-05-26 23:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 820f1c947b591864b4062ed415595e48 SHA-1: 9fa7c1464250a1b10dc2beaf7d6cb7ed975a5e5e SHA-256: 635de42fa52babab3e16e57ca2d99d5d137217e6390ae52eb3de4e580a08b815
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, https://mezovuduw.ru/strik?utm_term=jacksonian+democracy+worksheet+answers, is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'Jacksonian democracy worksheet answers', which is a common tactic for social engineering.

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://mezovuduw.ru/strik?utm_term=jacksonian+democracy+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467936/normal_5fe0899aaaed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_6014b93a658c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_6064ad33279d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401558/normal_5fe175460eeb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_603ea04d76da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6046b7207ea68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_6045f7b3942c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_604491a38f80d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_6007c822d7e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_603bb549c4270.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/a58dcb64-1ebe-4bd4-8eca-23f7aac6fce4/como_hacer_un_a_word_en_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715edb04-7777-4e11-8c0a-1221600f0b63/piston_software_direct_midi_to_mp3_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e52dde-bba5-47ec-856c-86a4a5ffe163/15352754285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fcab31-badd-41ea-911b-40f1870e0c04/grade_5_printable_math_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871792fe-ddc7-44fc-b06b-08c0f51f32ef/35534855717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3de4385-857f-41e8-bf84-485e82d438ee/what_is_the_value_of_f-1-3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ebf34b-efc0-4296-846a-d61632a67df2/6940630176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa7f8a0-c90a-448f-8803-84585603b7e9/wodakemokiz.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_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 5396 bytes
SHA-256: 0dd033e9375c6fa5410efeaddc90792fd6b0ad327075d7914da17117fa824135
font_01_sfnt_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 11432 bytes
SHA-256: accf1131451437b0be9acd836e80ed9eec345c500e831163556698f29aa0715d

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