Malicious PDF — malware analysis report

Static analysis result for SHA-256 725cef783d631426…

MALICIOUS

PDF

77.5 KB Created: 2021-02-25 10:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f3ab4bce102d74e41aa58ccd19365101 SHA-1: 74972086d5aa22a8bffe1690c8ab29a9b28b9b03 SHA-256: 725cef783d63142674e21d0e3b455c75c33869fb37d668f4ab5dc73fa8e507ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=where+to+buy+intimate+clothes PDF link annotation
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/zuzamari-piruraba-domikasuji-jimesitu.pdfIn PDF document text
    • https://mapavafamaluri.weebly.com/uploads/1/3/5/9/135999294/ludenubuketo.pdfIn PDF document text
    • https://zupitexugavasol.weebly.com/uploads/1/3/0/9/130969618/21e5880963b66.pdfIn PDF document text
    • http://tamakar.tech/business_english_worksheets_elementary5hbfa.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/7353870.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/fufeg.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/gegizafis_tekuroveze_lirepagosenatox_pibun.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/migivewuwe/jkbose_11th_class_private_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/redotivurufurovaniposet.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/aciera_f1_milling_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/gali_chirugali_naa_song_dj_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/the_body_shop_seaweed_balance_sheet_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/34698241986.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/72787756846.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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 5176 bytes
SHA-256: bc755b112f0a505bfc3852839f9fccdb2d1d7de909f4ff01d70986006e9f0ea0
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10672 bytes
SHA-256: 45e982ff5a628d82c72b831713e293f19c92b7be344d6373da3fc8f3450db27f
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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