Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a0e47860d59806…

MALICIOUS

PDF

72.6 KB Created: 2021-06-09 23:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e0f4f1e5c6216dd04d9306b407f6437 SHA-1: 780804b128f30c5bf96f7fdc051207300c06bb77 SHA-256: 40a0e47860d59806454a6d35580988fce328d4839e3fa9d74a4f7b01b5835a10
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://philabc.ru/pbw?utm_term=the+power+of+positive+thinking+pdf
    • https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/filuri_xeguboxobuzeze_lijigupe.pdf
    • https://litexude.weebly.com/uploads/1/3/4/5/134592330/dulipuzupipige_jebuvupukan_jabibo.pdf
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/8754049.pdf
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/8708868.pdf
    • https://sitatovap.weebly.com/uploads/1/3/1/4/131438195/6610061.pdf
    • https://ginijamuda.weebly.com/uploads/1/3/1/4/131409148/2449015.pdf
    • https://bokasopuvozanib.weebly.com/uploads/1/3/4/3/134319525/49d0622a6d7f486.pdf
    • https://dimafaxatabevex.weebly.com/uploads/1/3/5/9/135991177/3ac10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wufamazajo.pbworks.com/w/file/fetch/144561207/profit_and_loss_statement_template_for_nonprofit.pdf
    • http://ritijix.pbworks.com/f/sarah_kane_psychosis_4.48.pdf
    • http://sulegiwi.pbworks.com/w/file/fetch/144683775/86207948792.pdf
    • http://pojaweku.pbworks.com/w/file/fetch/144461922/kirkland_signature_natures_domain_puppy_feeding_chart.pdf
    • http://luwivaj.pbworks.com/f/how_to_fill_out_receipt_book_for_daycare.pdf
    • http://wixumip.pbworks.com/w/file/fetch/144812274/how_to_speak_gang.pdf
    • http://zilujilixeti.pbworks.com/f/32476726849.pdf
    • http://fevuxowina.pbworks.com/w/file/fetch/144806214/slither.io_zoom_mod_ios.pdf
    • http://pewamez.pbworks.com/f/avatar_the_last_airbender_2_full_movie_in_tamil_dubbed_download_isaimini.pdf
    • http://zeranagaro.pbworks.com/f/67647971837.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_off0000e064.bin
44e26b57b4324a8868a75a93532232e0957b58d1a34b003b2b3d2625a7337082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 5228 bytes
font_01_sfnt_off0000f245.bin
6c909630edb4b7c7e478e0738c11ad45440f567f9774266c28512bcf47feb559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10220 bytes

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