Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d2edd7cd349664…

MALICIOUS

PDF

68.0 KB Created: 2021-02-13 01:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 26fb6a704a4c5ff7205b699d797dbd22 SHA-1: f35151e8bbb790359ebb6068a270b72a7d0eadf8 SHA-256: a4d2edd7cd349664e20785a82e168a488c7e3056d02b6144daf1d8f35a617f01
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content, masquerading as manuals.

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
  • 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.
  • 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=manual+egg+beater+rotary PDF link annotation
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/kusetubukilon-dapil-riwonoliketom.pdfIn PDF document text
    • http://gufutaca5.xyz/carestation_620_service_manualkwzmk.pdfIn PDF document text
    • https://sutiwipuxepol.weebly.com/uploads/1/3/4/5/134517417/670dbf0bcac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6021d0b6adcec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5ffe413a1479b.pdfIn PDF document text
    • http://dfwshootersupply.com/kodak_pony_828_camera_manualpprcf.pdfIn PDF document text
    • http://ag-management.space/screen_recorder_android_note_9cniuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5fdbdf5a2e563.pdfIn PDF document text
    • http://mishabelle.ru/275651153345kwoa.pdfIn PDF document text
    • http://pasendapp.online/zamogexesigaza0cmwq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_600ea52a2cc1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_6013855359d2f.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/waxegatulo/35634083176.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/meri_behna_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/basic_life_support_exam_a_answers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/42718674304.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/hollywood_movie_tamil_hd_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/38334708633.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_off0000c20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20E 4756 bytes
SHA-256: c640f2d034353eb80398b7c46cc5b86ea284e45138f61b9e6f9a122ca3169122
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 10188 bytes
SHA-256: 5914f1fdf2c15d5fccd0769a929d55abae2044f9a47db25f1fbd89700b93dd3f
font_02_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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