Malicious PDF — malware analysis report

Static analysis result for SHA-256 876ef1af0e528b4a…

MALICIOUS

PDF

74.0 KB Created: 2021-03-27 10:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 471960771c1b04b86cb0f1325936a3e0 SHA-1: a5e7345aea1554c5a0c621698518dca27bf222bc SHA-256: 876ef1af0e528b4afe78224bbd7d5080b3d4fb5980550fe5c070e221ebdcf759
104 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The presence of a download button lure further supports a phishing attack pattern. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a secondary payload.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=maths+kumon+worksheets+free+download PDF link annotation
    • http://sozaxesugoj.mywebcommunity.org/40465777662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393028/normal_602a591c89230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5fcfa95e1659a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5ffbea404eb93.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/dragon_age_asunder_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_603936ab0abbf.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/zolerazowubow/2010_ford_f250_diesel_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/2015_kenworth_t880_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0360809f-246e-4aff-a8bb-b49b89b9dedc/how_to_train_your_dragon_in_real_life_movie.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_e86693fb8c1a419e94eaba0103b44740.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_1ed6fedc967a43bcb6bbd7d82a153f73.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/denakolusinuluwuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/how_many_calories_a_one_year_old_needs.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/17767535290.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_1867f6a55e934676b143a10858c6ac41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/540246f5-e9e5-497d-a299-5ed635c42a84/the_x-ray_control_panel_must_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf268a5b-c9aa-4c48-a06f-fbbe12b6b524/metal_gear_solid_3_walkthrough_no_commentary.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_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 5144 bytes
SHA-256: a891e7207c9293f1c7513252dbaf51788273048e2e4e5cd68a517544002e0a33
font_01_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 10232 bytes
SHA-256: 9a8dce69b4a6258f858d019632d1b39927f565198c6afeea897717f9fa74d8a3
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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