Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c194b8f44f0d8b3…

MALICIOUS

PDF

80.1 KB Created: 2021-03-01 12:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 90415aaf028fd546f59ce3c5d23c50db SHA-1: eccf9faaf2f94d90542d8b12d9d1ca3c45fd35cb SHA-256: 0c194b8f44f0d8b3796ca0a6dd9281100ac271d377320d2f57841d822d3f7a8a
96 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 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. One of the embedded URIs, 'https://xajibur.ru/strik?utm_term=jump+attack+dark+souls+2+xbox+360', is a primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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://xajibur.ru/strik?utm_term=jump+attack+dark+souls+2+xbox+360 PDF link annotation
    • http://kismyketio.com/7314190711asvm0.pdfIn PDF document text
    • http://disconto50.info/how_much_does_a_nutritionist_cost_nztjxok.pdfIn PDF document text
    • https://rifejirofedum.weebly.com/uploads/1/3/4/7/134763588/3243626.pdfIn PDF document text
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/sebarido_paxelonubek.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/moultrie_w35i_game_camera_for_sale.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/kategopumodeniv_tijefubepukudot_bawutusum.pdfIn PDF document text
    • http://am-sound.ru/89432282857b6kjr.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/63112219773.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/bezutu/tovafonuzatalezesu.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/53882307668.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/17725377277.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/tibozezigesor.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/target_organic_sheets_threshold.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/why_phospholipids_form_bilayers.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/bonunifotiwajipak.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/across_the_universe_full_movie_english.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/bullarium_franciscanum.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/77392410974.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/33450976424.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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 6072 bytes
SHA-256: aaf1316fc01d5ef616d5fa506270c1da39a503feac02a3dae563048721863ff2
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 10704 bytes
SHA-256: 69f047c10b76cd5dd28d5f2b5f8002d73ff6212606e9b7199aaedc02a9dd925c

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