Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b5e1418502ef78…

MALICIOUS

PDF

78.9 KB Created: 2021-04-30 17:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 15262603d93da34a68317352082abc0c SHA-1: 8a3526b758559425ead6bd548941c752b6e7adcc SHA-256: 46b5e1418502ef78d2c02e6934eaccdbb8e32bbf7b6cc4b1a86dd2ef0edfa5cc
266 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a suspicious lure to external domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to wkhtmltopdf and potentially lures users to download further content via embedded links, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 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.
  • 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.
  • 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.
  • 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://vilenefex.ru/strik?utm_term=taking+sides+book+clashing+views PDF link annotation
    • http://ig-supportcenter.xyz/daniel_fast_food_list_jentezen_franklin8tzot.pdfIn PDF document text
    • http://mx50off.info/information_overloadk7f57.pdfIn PDF document text
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/mizezepu_pudesa_kibonogu_vubodag.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/delete_blank_page.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/baldur_s_gate_guide.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/c79c5443.pdfIn PDF document text
    • http://opensoda.pro/pofotodozos5q1hs.pdfIn PDF document text
    • https://sefatepasegul.weebly.com/uploads/1/3/0/7/130775173/motavewegeni.pdfIn PDF document text
    • http://baugroup.info/can_you_airplay_on_tcl_roku_tvkqo7o.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/holes_character_analysis_worksheet.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/480c23c95e74.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/barron_s_gre_math_workbook_free_download.pdfIn PDF document text
    • http://d-youtube.com/how_to_use_light_therapy_at_homeawqvh.pdfIn PDF document text
    • http://lofitner.buzz/how_to_do_a_risk_assessment_matrixai94k.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/9232971.pdfIn PDF document text
    • https://lutasuboli.weebly.com/uploads/1/3/2/7/132740498/risawidoz_xunetubixovo_lisorawos_gidazomu.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/293ef80c79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaloruligot.onlinewebshop.net/fikunagigiraxuwotox.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_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 5408 bytes
SHA-256: 81e5d3e6785364c835ba7bcfeeeba280d6131f72db14353315ab98d7afa80610
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 10484 bytes
SHA-256: eb97060a88082d8f853e189a713e8fe30149bae7d05a3e86db9299c88aa238ef

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