Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66694fcb3b6b74d…

MALICIOUS

PDF

70.6 KB Created: 2021-02-24 07:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d7fcb4f75b756d2f692cc14fa8ff00 SHA-1: 01a4b5205ef129fd4b64f3cf6d3968dd0c01289a SHA-256: d66694fcb3b6b74d7f8eecc69edb656bdac04272c046e2908d26068fcf38eb93
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that directs the user to a website disguised as a worksheet answer key, likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=making+stuff+cleaner+worksheet+answers+quizlet
    • http://nosinoski.shop/57545588614587ga.pdf
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fc9aec6a9c79.pdf
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/42fb615c5fe.pdf
    • http://info-pages.ru/similar_and_dissimilar_fractions_worrze49.pdf
    • http://wusuraxirobi.iblogger.org/free_guided_sleep_meditation.pdf
    • https://cdn-cms.f-static.net/uploads/4490273/normal_5fe6345131d9e.pdf
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf09b7ea673.pdf
    • http://disclosures.space/8091682549316c29.pdf
    • http://smallita.space/ps4_gold_headphones_cutting_out0kiny.pdf
    • https://kelesidudukakub.weebly.com/uploads/1/3/5/3/135340861/4909594.pdf
    • http://wedagumo.iblogger.org/limiting_reactant_worksheet.pdf
    • http://white-x.fun/adwcleaner_toolslib_thank_youroxhh.pdf
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/74981a.pdf
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd6771bb638d.pdf
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/2243949.pdf
    • http://sofuwabafa.iblogger.org/pl_sql_interview_questions_for_5_years_experienced.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wevosana.rf.gd/paxafelurekamizogofozo.pdf
    • http://zideniniwos.epizy.com/graphical_method_of_adding_vectors_worksheet.pdf
    • http://redusaboj.epizy.com/asphalt_8_free_unblocked.pdf
    • http://bopunuzas.rf.gd/61298391559.pdf
    • http://resutujimi.epizy.com/how_to_reconnect_my_viper_remote_start.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_off0000d6b1.bin
8e716c680bda021c5022359c9c832ec2bce23c0b6eec1a16cc924c74aad72d67
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 5480 bytes
font_01_sfnt_off0000e97f.bin
047af49f5dc5a578c89d3be8b8bd1db8f23663d0cb5b88d7b429755e3a451a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 10432 bytes