Malicious PDF — malware analysis report

Static analysis result for SHA-256 2832ade68a0c2b44…

MALICIOUS

PDF

78.2 KB Created: 2021-02-22 08:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9be19693cb08b99bea9c05a6b2ca5ab7 SHA-1: 884c0c73847ad949b45dbc626c8f80e87ae11890 SHA-256: 2832ade68a0c2b446b65af190f5380557e775335ee63e6ac6a7498e37edb0894
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of many external links suggests an attempt to lure users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://baarspo.ru/wb?keyword=teaching%20methods%20in%20nursing%20education%20slideshare PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370525/normal_601a30ac2d67a.pdfIn PDF document text
    • https://balalowomave.weebly.com/uploads/1/3/0/7/130738893/jomekifexunuvik_buzukepitepun_towekudegil_popazuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/84LhbvW/medical_doctor_career_description.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/MiaifTh/zomedabalotalogefewun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384304/normal_5fe10f73306e3.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/bD5EGgj/faniseroxaxof.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/wimexifo_kowezer_fawotoxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/geicr6f/call_of_duty_warzone_gameplay_youtube.pdfIn PDF document text
    • https://mubafuzolifuben.weebly.com/uploads/1/3/4/6/134644730/96538527a.pdfIn PDF document text
    • http://euromarket.pro/o_existencialismo__um_humanismo98hlx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_5fe60dd58e36b.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/5587888.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/0e3865a883f1b.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/lezerukasiwelo.pdfIn PDF document text
    • 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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 5300 bytes
SHA-256: 52c2a7b096e568529833dbc4b748c3ca2723155bfc64dc0f6e70f79276aa2d98
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 11028 bytes
SHA-256: f6d9a79f7db07ab88cceae7482a91eac7f79907d1b398523510fc6f581849bf1

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