Malicious PDF — malware analysis report

Static analysis result for SHA-256 4921d7273dd82608…

MALICIOUS

PDF

69.8 KB Created: 2020-12-28 20:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: abc240ad886b70e145ee9d253c806f61 SHA-1: bfebeac397f48a611fd9b104d9c8fec214a6f3ab SHA-256: 4921d7273dd8260800023356a244f9356eeec33878530987ed5c5e5f7eb85427
254 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, including a known malicious redirector. The heuristic firings indicate it's part of a link farm and flagged by ML classifiers as malicious. The document body, though obfuscated, contains text related to a 'Zombie run game', suggesting a lure to entice users to click on the embedded malicious links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffking.ru/strik?utm_term=zombie+run+game In PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/1458682.pdfIn PDF document text
    • https://mutodebubopuvom.weebly.com/uploads/1/3/4/3/134373551/pibaziwukezi-daxovibekadax.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/hgjb9kf/25190276865.pdfIn PDF document text
    • https://volosodavebogo.weebly.com/uploads/1/3/4/8/134873809/3373d2b50e0463.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/cieLgic/garelefejo.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/4d9c5.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/lewuravasu/cieLgic/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/pexebugarug.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/69573400830.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/create_chart_using_multiple_sheets_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/perception_process_stages.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/77866767913.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/curly_font_style.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/aiff_format_player.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/tevigotu/free_addition_properties_worksheets.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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 4892 bytes
SHA-256: fa9e197da184ce9d60347a6e2e1155263b5e810b0067571e4b98a4e42ad70181
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10420 bytes
SHA-256: a3088b0d1932b70527b5ccf476bbdf3a23168db72a29cbb0ea0fd20e740c5bd7

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