Malicious PDF — malware analysis report

Static analysis result for SHA-256 c239987be6337026…

MALICIOUS

PDF

80.7 KB Created: 2021-02-22 16:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3e81f0c43416793d9f136a66206682c SHA-1: b4ff35384a324cc9031da6ff54dc1486f4b2b79e SHA-256: c239987be6337026a51f0fddc854eba69daf8a809fd1429d0af39f6fe6e1836e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to disposable hosting and are associated with redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to generator maintenance, designed to trick users into clicking the malicious links.

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 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/strik?utm_term=what+kind+of+oil+goes+in+a+predator+8750+generator In PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/xipufeminitigadikosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fc7c7f94d522.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/muxokasajemuneniparo.pdfIn PDF document text
    • http://faguduni.22web.org/cuales_son_los_tipos_de_grupos_juveniles.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/b788ddfe584748.pdfIn PDF document text
    • https://xonajuximo.weebly.com/uploads/1/3/5/3/135311854/af1d045.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/hakIbwQ/9188604292.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/tKqlic1/73199052587.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/harih6o/22935639661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5fe097e8227ce.pdfIn PDF document text
    • http://jolowenifar.iblogger.org/koxukixurawokunaso.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/hhhGh5I/74136123884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_602ff4c959b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_6029aeb9d5fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601bb2b5dd275.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kegubinefuda/chitralahari_prema_vennela_ringtone_naa_songs.pdfIn PDF document text
    • http://xivobotaxonid.epizy.com/terufiduzipifugusifulex.pdfIn PDF document text
    • http://lefabeku.epizy.com/electronic_devices_interview_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5708 bytes
SHA-256: f9368d1888bfa9abb7a2fa94a87f78987e4a0c10e3cfefd02f4842ffd2105ac5
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 10780 bytes
SHA-256: 0506e3bef96fa111ae1e87e7563d7f5cff4a784dce0e9b5196fa4ec509a1f000
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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