Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fad518d6d3b1aa6…

MALICIOUS

PDF

75.9 KB Created: 2021-05-21 10:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b6ce6d253717b1cbd2f9530620b2e112 SHA-1: 1b6ea3cd56a2f027877bcca0fac954a157388322 SHA-256: 3fad518d6d3b1aa6bf1f7acf59760710467511e0c6fc8c6fa717fe9d531206cd
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to free Instagram followers and likes, which is a common social engineering tactic. It embeds numerous external links, with one prominent link pointing to a URL that appears to be part of a link farm or redirection service. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://druttle.ru/strik?utm_term=get+free+instagram+followers+and+likes+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fea40f20452f.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/7144951.pdfIn PDF document text
    • https://miwozomeme.weebly.com/uploads/1/3/0/7/130775979/mipamakuwanu_wadujubivud.pdfIn PDF document text
    • https://raxuvupu.weebly.com/uploads/1/3/4/7/134707125/5135124.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/bofev-watar-fuxate-lobuvonutal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60269dabe8c00.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/266891d1f215f.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/3d61a933853e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fd7d27bbc01a.pdfIn PDF document text
    • https://xowonijateroz.weebly.com/uploads/1/3/1/3/131380337/kaburusa.pdfIn PDF document text
    • https://mafalipakirufez.weebly.com/uploads/1/3/5/3/135347960/f7258a23f4d4ee.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/jubiferekaka/dungeons_and_dragons_players_handbook_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/credit_report_canada_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/xizomomoxigobupividigoget.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/blank_picture_frame_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/whirlpool_washing_machine_drain_pump_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/edmentum_answer_key_english.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/nuvezefuwudokaxusaw.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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 5548 bytes
SHA-256: b390b2e9dc5ef3321798551468fdb32acc978e55e32eae203f4de1d4b8d76988
font_01_sfnt_off0000fe7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 10456 bytes
SHA-256: 5923fbbe34c880234414085d86f52244bc48864b3241f3737bae133c32645ce9

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