Malicious PDF — malware analysis report

Static analysis result for SHA-256 477e5bf18b9245cd…

MALICIOUS

PDF

84.1 KB Created: 2021-01-10 18:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f8962e67d422913a72f6da1ef46accbc SHA-1: 082831ff1785f2dacafc991a235ea36cd409c01b SHA-256: 477e5bf18b9245cd916c835cff9fc5ca4362aa7340bdbe08887bda4653519628
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links pointing to various external websites, including a known malicious redirector. The primary function appears to be directing users to potentially harmful content or phishing sites.

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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=duluth+school+district In PDF document text
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/suwurejezimul_buwepebabiva_virojekimobuwak.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/xobibepu.pdfIn PDF document text
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/8416038.pdfIn PDF document text
    • https://site-1172884.mozfiles.com/files/1172884/download_american_block_sniper_survival_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/cAi3idJ/city_hot_wheels_racers.pdfIn PDF document text
    • https://site-1175307.mozfiles.com/files/1175307/free_kick_goals_list.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/ilihkjj/real_followers_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/OdgiWjb/retro_racer_coffee.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/16509fe34e3b.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/gjaKbjc/tugikeredif.pdfIn PDF document text
    • https://site-1172092.mozfiles.com/files/1172092/cross_stitch_kits_for_beginners_ebay.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/889e0e9ecbd.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/xhfhfvP/papusabepa.pdfIn PDF document text
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/madiforu.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ieBi4ok/find_my_friends_apple_ios_13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 4816 bytes
SHA-256: 5724aadfd18b20c9497b31a33d50b1202f4a4b8aebe9e3601373a61f009072f8
font_01_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 10724 bytes
SHA-256: 4f5da1240f6f7775bd16692f418cf41f453eed4763a49683ba4c3f6185b54e7b

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