Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b905e3dbc8ba5ce…

MALICIOUS

PDF

64.9 KB Created: 2021-01-11 08:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50aebd3f4a8c45fa2f3565c18af8111f SHA-1: db4e85bfd6f1d7d98f2a5000ab890773697707cd SHA-256: 4b905e3dbc8ba5cebcd982b9853ed788c97ab5e8974c53eb4551d14d0f3de2fb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URL identified is trafffi.ru, which is likely used to redirect users to other malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=bilinear+transformation+which+maps+the+point
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/xewaretadilitiv.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/6589749.pdf
    • https://cdn.sqhk.co/kedilexele/gjgiIT9/97705013926.pdf
    • https://site-1177800.mozfiles.com/files/1177800/92609492943.pdf
    • https://site-1173572.mozfiles.com/files/1173572/amazon_golf_clubs_callaway.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_5fbe80a71ba1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisoxow/science_fiction_story_worksheet.pdf
    • https://s3.amazonaws.com/jefobexapulow/fun_book_reports_for_high_school_students.pdf
    • https://s3.amazonaws.com/lanubili/mini_adirondack_chair_template.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/murray_explorer_go_kart_manual.pdf
    • https://s3.amazonaws.com/vavebufevodutob/2019_movies_in_tamilrockers_in_tamil.pdf
    • https://s3.amazonaws.com/kabisebax/blue_macaw_bird_life_span.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_off0000beda.bin
fd6f59e32fa3f044bb97b68a685c8b8dcb7a59c970fb9e0af84ffdf5351b13e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDA 5396 bytes
font_01_sfnt_off0000d120.bin
ce750b05a4bfb427be5e509aab7b3434470b3248fef157edd3bcc59386d274c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 11092 bytes

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