Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c68d8764ac7ec05…

MALICIOUS

PDF

74.3 KB Created: 2021-06-04 10:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9da8f5b61371e6f31d05dc47ad2ef885 SHA-1: 265fe736181ac6aeff1f9495c88e8a0efaa5392c SHA-256: 5c68d8764ac7ec054552c939e60b14672375de02908f0528e4c4b0fa8b666c73
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with the primary malicious URL being krisoc.ru. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The embedded URL suggests an attempt to redirect the user to a site that may host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/pbw?utm_term=hack+engine+for+android+no+root
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6052410cb6d7c.pdf
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6012878fc66f8.pdf
    • https://tazegeravi.weebly.com/uploads/1/3/5/3/135390309/likaxa.pdf
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffb0cff711fb.pdf
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/bffad4d318e49a.pdf
    • https://static.s123-cdn-static-d.com/uploads/4409409/normal_60b308568fac4.pdf
    • https://nexojavadu.weebly.com/uploads/1/3/0/7/130775828/bobabin_jisutolelot_lozominixa_wezorezumes.pdf
    • https://cdn-cms.f-static.net/uploads/4403557/normal_6032f2acb8f03.pdf
    • https://static.s123-cdn-static.com/uploads/4480876/normal_5fdea6b220a31.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_605117a5cc539.pdf
    • https://milolavum.weebly.com/uploads/1/3/4/7/134717842/2944487.pdf
    • https://static.s123-cdn-static.com/uploads/4459792/normal_5fe51cdad9161.pdf
    • https://cdn-cms.f-static.net/uploads/4420434/normal_602480d5f0839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5fba72bc-589a-409a-9aad-9ddfc5dc0b36/principles_of_highway_engineering_and_traffic_analysis_5th_edition_si_version.pdf
    • http://vadobadud.pbworks.com/w/file/fetch/144600699/18628799502.pdf
    • https://uploads.strikinglycdn.com/files/5f40c191-88fa-4491-90da-5344560b8286/89769612782.pdf
    • http://lufokomarib.pbworks.com/w/file/fetch/144561084/wogapuxamojawegof.pdf
    • https://uploads.strikinglycdn.com/files/93a91801-26ed-4cdc-9f9b-6a5e5defaeff/16171674899.pdf
    • https://uploads.strikinglycdn.com/files/9932b7f3-e93b-41aa-954d-2a2c33c714b7/62354239018.pdf
    • https://uploads.strikinglycdn.com/files/90ce844a-5a18-4650-98fc-d01777c3c6ba/vax_platinum_power_max_carpet_cleaner_how_to_use_upholstery_tool.pdf
    • http://larabefejaji.pbworks.com/f/72095023261.pdf
    • https://uploads.strikinglycdn.com/files/66f23cd2-1a7c-4b6b-9f4c-2172a47cf7f7/organizacion_funcional_empresa_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/fcc9dffd-1238-493b-94d5-4b6adf067e30/jesus_interrupted_goodreads.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65e.bin
b7d3d13bd50da68bf1ac0e4ad6d4b7c90aadc41d0c96332c788ee7a803ca7aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 5004 bytes
font_01_sfnt_off0000f778.bin
4b10e2011765838fa935dea794adde0fb73752baa14f3a878c1a0df33f0550c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 10532 bytes

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