Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b965c7c9bbb43d1…

MALICIOUS

PDF

66.5 KB Created: 2021-01-27 04:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4e8dadf453be60246725d17c4e582200 SHA-1: fb12e66d4b2baea7713182c99026ccfe56985bf5 SHA-256: 8b965c7c9bbb43d1311fc5394507bbdc7accf651bc1ff43030c4235f4c213c4e
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, specifically as a phishing trojan. It contains an embedded URL pointing to a potentially malicious domain, which is likely used to host or deliver the payload. The document body, though heavily obfuscated, suggests a lure related to educational materials, consistent with phishing tactics.

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://bologen.ru/123?utm_term=chemistry+scientific+notation+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369912/normal_60109f9dee049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_600b567901c3b.pdfIn PDF document text
    • https://cdn.sqhk.co/jebanufebejo/fzUjjgo/artificial_intelligence_a_modern_approach_4th_edition_pearson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5fd67103ec0b6.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/ieMpiaM/gopurudovabegajuzumatem.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/inspection_checklist_template_word_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fdfd8eb249f1.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/EjjIhcD/best_music_ringtones_tamil.pdfIn PDF document text
    • http://domifonupesif.iblogger.org/forklift_safety_test_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484107/normal_5ff807209f8ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizinesuri.epizy.com/27792475581.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/cerro_gordo_county_sheriff_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/bassaleg_high_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/viruvitokol.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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 5252 bytes
SHA-256: 67b90e520c144e67322c9aaa1c757fab056aa5c6ce4f455b30fdc13e0541714e
font_01_sfnt_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 10136 bytes
SHA-256: 3fa70fc1d7c17bcc8c184c1aefbe49ae3b2cfc36890e175bf8307b630a7b9244

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