Malicious PDF — malware analysis report

Static analysis result for SHA-256 25149ab9c19df8f4…

MALICIOUS

PDF

76.2 KB Created: 2021-02-09 14:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 065be87c7bf69d2ed25e6e80958643c8 SHA-1: 43e0be6d05b0750d149c79646d970dba153e3e34 SHA-256: 25149ab9c19df8f48c4b9e8d581ae9e5a21e47d78ea9967c6c92742725fb01d3
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The presence of a 'Clipboard command execution lure' heuristic indicates the document attempts to trick users into executing commands. While no scripts were extracted, the overall structure and heuristics strongly suggest a phishing or malware distribution attempt via embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crophysi.ru/aws?utm_term=eclipse+neon+for+linux+mint In PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/sjdxBqz/free_police_scanner_app_for_iphone_6.pdfIn PDF document text
    • http://org-fruit.space/pen_pressure_not_working_paint_tool_sair9kc3.pdfIn PDF document text
    • https://fazipebafutemi.weebly.com/uploads/1/3/1/8/131857540/nufopakidib.pdfIn PDF document text
    • http://proba7.xyz/metugogzg9mi.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/ijiahcm/nemavatejulizipor.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/vegibevefusovor_waluwibar_liliwite_demep.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/vande_mataram_kannada_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/R4iRJk0/givumuvuzufadobuga.pdfIn PDF document text
    • http://normal-id.com/evolucin_histrica_de_los_subgnero7xur1.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/geiachc/queen_greatest_hits_songs_download.pdfIn PDF document text
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/gadawagebizowo_jukotaduvoded_xolexeparew_vubilikovegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumerezuwo.epizy.com/nexuwamabawulelarunofo.pdfIn PDF document text
    • http://wosamufudov.epizy.com/pandoc_html_to_example.pdfIn PDF document text
    • http://mukadepokexow.epizy.com/ansible_template_full_path.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/ignou_b._ed_books_in_english.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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 4976 bytes
SHA-256: 3942865a3c12156690d4c12a981b4326209f69c3b00838c839001a59f3efea1d
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10656 bytes
SHA-256: db5f5bca394bef032cc916dc7caf2fd93da1c1be170b44eff81aaafba3f9e1b4

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