Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56339614f572694…

MALICIOUS

PDF

85.9 KB Created: 2021-05-27 04:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e968d4459957dd78dc27bf39d3987e3d SHA-1: eb9c460c072ac1d4b33a33f0a09614be7ba01b51 SHA-256: f56339614f572694424d21ca495af2b74b0a6c182c2fc7cb15b8fab189eee761
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary URL being `https://jottigo.ru/strik?utm_term=what+is+the+most+popular+brand+of+cigarettes+in+uk`. This suggests the document is designed to drive traffic to this site, likely for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://jottigo.ru/strik?utm_term=what+is+the+most+popular+brand+of+cigarettes+in+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd5fddc29e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fe74c58534c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_6056359dd1dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484990/normal_602486b696b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_6049a19f4e4ed.pdfIn PDF document text
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/molizetavofidazoroz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_603fbc0338d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_6020033a6fb67.pdfIn PDF document text
    • https://damasixo.weebly.com/uploads/1/3/5/3/135322107/2647558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5fe85805a1444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_600abef330aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe1739448573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_6041359e27c9a.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/sepidunod.pdfIn PDF document text
    • https://wifirinopemuv.weebly.com/uploads/1/3/4/7/134762260/piterurugeralokog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6328fbdf-d32a-48eb-8784-5fdcdf8d9166/french_in_action_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf7d4f5-e7de-44fd-8b85-9e4b0f2a3988/spiritual_discernment_watchman_nee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107ab585-007b-4215-a7da-8accedb7d1d3/32074372658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4c33e9-3bac-4dda-9a38-c18b05760c12/reglas_generales_de_acentuacion_rae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac9ac1d-f357-4fef-a95f-3f92bc9a201d/time_warner_cable_nyc_remote_control_codes.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_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 5784 bytes
SHA-256: 55be14c94f2144bfa5d180d723d8e3ad23c706ab0512bb9204c331a1620cb27a
font_01_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 11020 bytes
SHA-256: 5b39fc251cf457a0333fe4c3abc324de2590542f29ebc6163eae02cecc63e0d4

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