Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdf47b59233c83d…

MALICIOUS

PDF

64.2 KB Created: 2021-02-26 00:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f1614b305d8f4f4ae391ccd568122db SHA-1: 575bd745e7af69c0dfe74fd8501f1fa704ec47e9 SHA-256: 5bdf47b59233c83d1ee87dd47364ee5c10f46f1670b46051a0d4e222e2cf4634
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to academic materials, likely to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=lewis+dot+structures+of+atoms+and+ions+worksheet+answer+key In PDF document text
    • https://manedubel.weebly.com/uploads/1/3/4/5/134587872/28d39b6be3fb396.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/jebasujatope_bepudumi.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/mawosof.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/kezuv.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/GgFjhia/dnd_5e_animal_companion_sheet.pdfIn PDF document text
    • https://takojetomegupaj.weebly.com/uploads/1/3/1/3/131382497/457cb4345b2.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/juduk/75962426181.pdfIn PDF document text
    • http://retudazugo.rf.gd/30685154136.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/81059715293.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/bokevusexifuvasokitapufo.pdfIn PDF document text
    • http://vuxubeso.rf.gd/vijitana.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/17137494674.pdfIn PDF document text
    • http://mudepenota.epizy.com/princess_diaries_books_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/39958731708.pdfIn PDF document text
    • http://powajokex.rf.gd/briefing_note_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/allegiant_2016_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/79477697238.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_off0000c057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC057 5428 bytes
SHA-256: 72873b4cc3b9842218e1e42f11bbaccf7f4021932267b260b4a371686e9d2423
font_01_sfnt_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 9584 bytes
SHA-256: bbd66baecff6effdf9471a4961b8ba91e98e7e31d2b02105f8a12f8b73f234ab

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