Malicious PDF — malware analysis report

Static analysis result for SHA-256 911bacbe0ef24e62…

MALICIOUS

PDF

79.9 KB Created: 2021-02-13 15:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a5f4298394b4df7eaa883ca3bdbb0264 SHA-1: 97a15d65d76a2e52710a7f3b988c8239b2671652 SHA-256: 911bacbe0ef24e62ccc7d892e9e55113a8153d24b41f832cf304224637e7f327
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to external 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
  • 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.
  • 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://jottigo.ru/wix?keyword=alabama+crimson+tide+basketball+schedule+2018 PDF link annotation
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/zadaxefubamatibexaza.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/alifByk/police_auto_auctions_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/hc7wGyr/3215438229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5fe28579427f5.pdfIn PDF document text
    • https://cdn.sqhk.co/dofulokune/Picshh7/4498621603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_6011b6133e000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_602351046bd42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5feb8c75423fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_600bbbbbf25f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_6024c63065d34.pdfIn PDF document text
    • https://manomukujoputu.weebly.com/uploads/1/3/4/5/134517900/kuzatotuxo-kosebiwisewifu.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/sYg7iil/swimming_in_ocean_dream_meaning_islam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_6001c9ff4b2f8.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/shfX1vS/japanese_r_b_music_artists.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/XSAjjuL/jugibinawomas.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/Yggzyhj/curling_3d_apk_mod_diamond.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fe629f1d862e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fe9f5cae619d.pdfIn macro / runtime command snippet
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/3ce3d31a0c9ea.pdfIn PDF document text
    • https://ratisatemapabuz.weebly.com/uploads/1/3/1/3/131398591/3624346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/In macro / runtime command snippet
    • 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_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 5892 bytes
SHA-256: 78713fe0156604906934f4c07c94e109c6dd8cb0d237d159e2edb3ca14d52360
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 15236 bytes
SHA-256: 497fed4a5b763e24b70b58425a4658685d83173a9f0ede9806af31649296eab7

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