Malicious PDF — malware analysis report

Static analysis result for SHA-256 6550de157fb7e980…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 17:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06fd9f0080df5db6c1ae6b58e4de710f SHA-1: b2d7776a068f407e0a62e17de60ee7688823a170 SHA-256: 6550de157fb7e980cd44ff38f61c850255114dfc771623fb8221ef2673bf88d1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=letra+de+stressed+out+ingles+y+espa%25C3%25B1ol
    • https://cdn.sqhk.co/jigitovewuk/x74yjhC/t_mobile_sprint_connection_issues.pdf
    • http://streamsweets.com/toolwiz_photos_pro_editor_mod_apk_download0cpo8.pdf
    • https://cdn.sqhk.co/giganopof/kXOgfbs/flappy_bird_guinness_world_record.pdf
    • http://tukameduk.22web.org/inference_worksheet_4th_grade.pdf
    • http://romeital.space/codigo_postal_surco_limaeiteg.pdf
    • http://suvonenexazu.mywebcommunity.org/nofafivimif.pdf
    • https://cdn.sqhk.co/jajotulix/jfhejik/nekinudim.pdf
    • https://cdn.sqhk.co/fuvebopeweb/b6jhiel/mazibap.pdf
    • http://golden-charm.ru/sutuvidadokufasakik0wp52.pdf
    • http://kulovemalam.22web.org/95362284.pdf
    • https://cdn.sqhk.co/titolegun/CmLhcha/break_down_your_walls_lyrics.pdf
    • http://jakiduve.scienceontheweb.net/belajar_adobe_photoshop_pemula.pdf
    • http://denizan.com/e-commerce_2019_business_technologygyn93.pdf
    • http://filuxunokenobud.mygamesonline.org/3103457825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://reluwiz.epizy.com/benade_fundamentals_of_musical_acoustics.pdf
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_3dfe641d6be747718a8eb8377efb6e10.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_e848f63d6bfe4f26a5e71ae0782afede.pdf?index=true
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_7ed69ee89f9046098f0c0e2c5292618c.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_8bdf36234c7e4943b9641d6514f90902.pdf?index=true
    • http://ferodibev.onlinewebshop.net/jatirobusokifakika.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_off0000e4d9.bin
f58eceaea4966367d7236a01afd306338dd40bd5c1ccd7fdad9189280dbb1bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5380 bytes
font_01_sfnt_off0000f700.bin
89a8954877b8cfb7caba15be5e3e4179a19b16e3458c2df8c910a5b55eb93307		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 11708 bytes

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