Malicious PDF — malware analysis report

Static analysis result for SHA-256 8564b75cfdaef956…

MALICIOUS

PDF

80.3 KB Created: 2021-02-07 06:11:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3be81b4a843fea85dee797141b9dc7e1 SHA-1: b444786740db280465ba43f3a0e0b52b9a57424a SHA-256: 8564b75cfdaef956e07577d9d3d40a4f0e2a7d79fdc1f80f256a24e0b1dae8e2
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URLs, 'https://seumenha.ru/123?utm_term=cult+of+the+dragon' and 'https://puriruwuz.weebly.com/uploads/1/3/5/3/135395363/b5bae0f66edc34d.pdf', suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=cult+of+the+dragon PDF link annotation
    • https://puriruwuz.weebly.com/uploads/1/3/5/3/135395363/b5bae0f66edc34d.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/jibilitev.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/fc632d77b5c2.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/jeponowon/chemistry_answer_key_2019_10th.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/40427110778.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/78854989620.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/billu_barber_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/58325297383.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/87254458999.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/macroeconomics_olivier_blanchard.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/motor_vehicle_bill_of_sale_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/apush_review_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/kindergarten_alphabet_worksheets_a-_z.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/articles_exercises_intermediate_with_answers.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_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 4896 bytes
SHA-256: fd015868b3d0a8277e57b1b459ff052bcda5ac5f6540b19b6b961626f1e5dbf8
font_01_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 10948 bytes
SHA-256: 68fe73f9715ba47b7bb5121fdf42fe89787642a0b7bd615d04dfe99f96ca3b16

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