Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87c5277297c80da…

MALICIOUS

PDF

71.5 KB Created: 2021-02-28 21:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dd1145effd7479977e93f454d99c8d35 SHA-1: da1c575bae9c7d79347ae1a5be2ff8f372b268cd SHA-256: b87c5277297c80da33c00b425bb709d4087f87f951fbea6bb174357025e6c1f0
96 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are to other PDFs, suggesting an SEO link farm or a distribution point for further malicious content. The document body, though heavily obfuscated, contains references to technical specifications and the authoring application 'wkhtmltopdf', indicating a potential lure. The presence of numerous external URIs and a high ML classifier score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=dell+optiplex+755+graphics+card+specs PDF link annotation
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/1928147.pdfIn PDF document text
    • https://sovawetozinunur.weebly.com/uploads/1/3/1/4/131407226/wudinuxekilej-pukedejo-xesawobe.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/tO4ZLjb/cartoon_channels_on_airtel_dish_tv.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/kazevutug_baxelexa_raruvoma.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/vujitibijezudigosuderi.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/Hfngcjf/thai_alphabet_tattoo.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/fuxor.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/hchigfb/server_rack_accessories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zijivevip/diboralika.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/wenedezeledisew.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/sample_root_cause_analysis_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/62228704991.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/whatsapp_plus_apk_latest_update.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/video_to_audio_converter_for_android_online.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/access_2016_add_calculated_field_to_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/how_to_change_for_someone_you_love.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/mezupovojopuwasa.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 5608 bytes
SHA-256: 96ea53666175954b8f4a59190bd127a8f5581af6860901f89a960ff38e880f31
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 11040 bytes
SHA-256: f7b933b19dba00e3835b7c068e6a7a58ae32922879b4fee13bc0a96b0448e866

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