Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb809cf0bcc1b17…

MALICIOUS

PDF

82.3 KB Created: 2021-03-26 07:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0437f4d9076ffc890def56d67eaf452e SHA-1: 59e3513a2bc5ab637c3cc0c455aacbab59d523a5 SHA-256: 3eb809cf0bcc1b17e75b909c62c77acd7690aa27e6d8ef8363648efce4cbbb24
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=construction+waste+management+plan+sample+pdf PDF link annotation
    • https://cdn.sqhk.co/kifuzopeko/givgiij/wezovonejowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495994/normal_5fd3ae2c5cc25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_600f91a0cb588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_6054f3ab50ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460471/normal_5fe4233865faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_6041f3618416d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_6023da14d0c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_600b3048d2db4.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/80793510620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_602f61462529c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_603c39c86cd54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_6023c6185ae54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601cabc292e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_6059c3798d0b3.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/hrijihj/garena_free_fire_beginner_s_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce8fc35ab0d.pdfIn PDF document text
    • http://zitosuganenat.medianewsonline.com/tratamiento_de_las_varices_esofagicas.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://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_11028545a3a5486f8706bec7d4070be7.pdf?index=trueIn PDF document text
    • http://tizexazebubo.atwebpages.com/crps_physical_therapy_protocol.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_b7f6f12ccbf74856a3e4f0a8b77473ff.pdf?index=trueIn 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5472 bytes
SHA-256: 03f72653d268b9535a688e532e726fac241c4b2aedfb0b57818b37b4cd1c507c
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 11216 bytes
SHA-256: d8bce7a83ccc670014c6f8e1f1e779453f329eaea2f569174b40e3421a991a4e
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2