Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8faff2ab50d86c…

MALICIOUS

PDF

89.3 KB Created: 2021-06-03 02:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b70d635be70e2ff84a16ed76f646dd49 SHA-1: 2adbe83a4663eac85a089c1a07e94d3ca215504b SHA-256: 0a8faff2ab50d86c21717b948221b6ee32322eb8e4131593f6030ba1a45e47b0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting, and one specific URL that appears to be a lure for a phone update. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://medvor.ru/pbw?utm_term=huawei+p8+lite+2015+update+android+8 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388420/normal_5fc7e3aae33e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_5fdbda0e7e89b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5ff7925f85b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_60490f50e6deb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fff15bfb7e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6029de2f6a0a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5ffe45d2618e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_6012bc9dc7d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5fe45bcd273d9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369632/normal_60b52da0a9c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_603f798ccb5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_606a7314c89b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_604728b0718f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5fe1330b391b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_60b7f9b4c8f64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5fe18a9a85541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_602a47a0eb295.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460678/normal_60b0a037891de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomexalipele.pbworks.com/f/xakakumuxavunidudeta.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/61633024544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc480b09-081a-46d9-8abe-ae301cb35dd9/la_familia_de_pascual_duarte_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab4d542-476c-48e4-862e-1fd3715dcc0f/best_red_light_therapy_device_for_face_and_neck.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144424053/how_to_download_fortnite_on_hp_chromebook.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/90064776774.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_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 5472 bytes
SHA-256: dff549aae4f58fe5304cd13c4d5ee7acf0ab30f0d78a0927975291458c548838
font_01_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 10668 bytes
SHA-256: 1059716b90e52701c106b75969290b5469b47034d4139eb199468454d857a834