Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fa73948652f2e7…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 00:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1cec8cc081c37c71d28291cbc81e572e SHA-1: 6a0f72e33a29d584ce4a95031af1e3684a9b4af9 SHA-256: 78fa73948652f2e72da954dd41836b7fe51d0741c82fc049c210e34e3bffbfc6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded malicious URL suggest it's designed to lead the user to a harmful site, likely for credential harvesting or further malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/award?keyword=how+to+insert+pdf+file+in+excel+as+icon In PDF document text
    • http://gloslides.com/2_what_are_the_four_basic_principles_of_oopsc0lxl.pdfIn PDF document text
    • http://nikiwibub.22web.org/kezeviponugit.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/xflgjid/idea_recharge_net_banking.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/hh5jghi/bazidibulijidurema.pdfIn PDF document text
    • http://trikotoria.ru/510382710674jj3n.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/wmnMsha/lion_air_crash_ntsb_report.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/heRbAp2/define_iterative_process.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/9iDbp5e/61467883363.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/dinigugaxej/3._binomische_formel_aufgaben_mit_lsungen.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/87403847351.pdfIn PDF document text
    • http://norilonabu.epizy.com/picsart_free_apk.pdfIn PDF document text
    • http://lalavuzotijosi.epizy.com/workforce_diversity_and_employee_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/55573848990.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/when_do_you_know_something_is_wrong_with_your_kidneys.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/58171491281.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/bengali_movie_songs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/company_tax_return_form_uk.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5272 bytes
SHA-256: 5f05f744f5c8bfa783b10243e9e8061c1fdc35dfe9671b9c17a70b88f6553f98
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10884 bytes
SHA-256: cd89afc73b93f56ce73b79b967a0127434ea21eb6d85c68ec0530ace589ebbe6

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