Malicious PDF — malware analysis report

Static analysis result for SHA-256 94757fc23c12a6ef…

MALICIOUS

PDF

73.6 KB Created: 2020-12-11 05:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b7e9bec67d0c8a8d52a226f0e7061882 SHA-1: 84e23ffb961a72fe9bacebd045a92ae967891fef SHA-256: 94757fc23c12a6ef748920ac658866dc368546fc7265a977bbd7c8b4b6032f44
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a known malicious redirector. The document body, though heavily obfuscated, appears to reference 'Cicerone certified beer server test answers', suggesting a lure to trick users into clicking malicious links. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffine.ru/wb?keyword=cicerone%20certified%20beer%20server%20test%20answers In PDF document text
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/26763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f9c73e636928.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/wixerisajijega_zetirova.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fegidowarokiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5895aec917750a3f71e5e/t/5fd03991ef76c20f2d41b0f3/1607481745785/tamozul.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/mobile_number_tracker_app_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/1495014944.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/free_thanksgiving_coloring_sheets_for_kindergarten.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cbc7c6d964583621a279/t/5fc108993c6ccf69f3825c53/1606486170807/gijumepabevuwog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de1fd12-6f51-481c-913a-52c931acb35d/84200288905.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/wilazevigom.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/apocalypse_world_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79a971b-6afb-4458-acb4-f9a38dad5974/que_es_un_biorreactor.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_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 5180 bytes
SHA-256: fcbe5ade5f2bab0fdb860de8cc76843b114332f5cc43b794ec35aa8d10d2605f
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 11312 bytes
SHA-256: 3e4770daf1a2e3454d33d4a60f07545fe53fe87421dc2a1532984433ab295735

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