Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d19193d3891a4be…

MALICIOUS

PDF

81.6 KB Created: 2021-03-24 04:25:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3c9831d93a81f6f8b20ec6b010fba6e1 SHA-1: da5c67666dff93502fe0e655c866faa5891d881d SHA-256: 5d19193d3891a4bea2dab5c73cbe50a7893d9b6f92d8bb7c34124289252f6116
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=fur+trade+apush+chapter+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422637/normal_60164a7aca778.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/5114400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fe8f4ad9f538.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/bagejirevumem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_603c72afc4ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6037eee07a2ea.pdfIn PDF document text
    • http://rewokujow.scienceontheweb.net/bascule_bridge.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/578712.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/6413608071.pdfIn PDF document text
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/lopililunosim_disupumizamareg_pataxoxaxovit.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/how_much_is_a_big_green_egg_xl.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/08e235753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_600909aa78cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_602bb13313d5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fcf7d894b7c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roveramo.atwebpages.com/wajuxenipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ed45ab-6962-494e-a9f5-b75ed5bb1e0d/how_to_reset_mp250_canon_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a355c6-70c4-4dad-98dd-fd18f5113fdf/dotisavimowage.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/toro_electric_snow_blower_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/hisaye_yamamoto_seventeen_syllables_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd213cd4-abfb-41db-a1bb-1aaf1c5c02fe/76306386635.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/business_case_brief_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50c3b67-1742-443a-acee-9606403f339e/64680771287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c3e3bf-7f18-4878-a793-6b1459831ac6/12235105853.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_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 5136 bytes
SHA-256: cf6c01cdc4d7c99dd30c07db8b2610c51840f48e8c577a28056502816796e195
font_01_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 11088 bytes
SHA-256: 7beb191815d910ae7230a37ab3f22174a17039c4ec71ef06038dc2caebff0472