Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bffb557a471836c…

MALICIOUS

PDF

83.8 KB Created: 2021-02-24 20:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 58ebee87f6fe95501660a4f7db01b084 SHA-1: 10b7efadc07e6de9f85fd396919058828e5dadd5 SHA-256: 0bffb557a471836c5d696f6da7ed6c422b8cb1be5471c406c63f3f08263561db
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirection and suspicious links, including a link farm on disposable hosting. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs point to domains known for hosting malicious content, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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=cub+scout+knot+tying+station In PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/gudeginijo.pdfIn PDF document text
    • http://erogan-encolumbia.site/66824173689k4ioy.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/6431654617874pcd.pdfIn PDF document text
    • https://jivezevovofefav.weebly.com/uploads/1/3/4/8/134896957/jovataxavajurere.pdfIn PDF document text
    • https://liketoxisok.weebly.com/uploads/1/3/0/7/130739237/fetaxapuzuvunifaz.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/gcjczib/clash_royale_hack_server_apk_download.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/58199649143.pdfIn PDF document text
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/7454763.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/wuvakigisaxixiba.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/9tngem0/best_instagram_tags_for_night_photography.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hflP91L/wikonimolejowatafakizib.pdfIn PDF document text
    • http://umniashka.ru/68187136383apc0g.pdfIn PDF document text
    • http://esagafow.fun/how_do_i_reset_my_onkyo_receiverq2bmn.pdfIn PDF document text
    • http://dematovaxitak.22web.org/nouns_worksheet_for_grade_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/majevixodagixotipurus.pdfIn PDF document text
    • http://podixevobelataw.rf.gd/solucionario_mecanica_vectorial_para_ingenieros_estatica_capitulo_5.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_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 5052 bytes
SHA-256: a775277ac8bbf3bd7f68f16d22a1553b8f745a6bb087d5b1a8c4999b45567480
font_01_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10212 bytes
SHA-256: 4bcdd94b2182c3714b9bb64f4eef43b958571e4478ac93ee14279d2dc182b44f

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