Malicious PDF — malware analysis report

Static analysis result for SHA-256 15848ba0d0617fe2…

MALICIOUS

PDF

87.7 KB Created: 2021-03-11 16:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: da46d5eb211e907e185374b198b2a730 SHA-1: 2a16741f265755499bb9f1aeb3983abb2b5a3baf SHA-256: 15848ba0d0617fe210fb6910473db21eb5085d6c726b537872a296b1a707e5ad
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=questland+how+to+enter+cheat+codes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489035/normal_60020358b18b6.pdfIn PDF document text
    • http://rakajipof.22web.org/96792872081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fdec9e2cd7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd170c12955e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_6001d768264ea.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/93111387734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_60491aadd6a34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484143/normal_60329d5cc4c6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwemasux.myartsonline.com/weathermaker_8000_code_13.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_1949a2b24aac46b682d70d04bd47bcbe.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_4e0c92ec5c8d4b39b598d1e5d0024ea6.pdf?index=trueIn PDF document text
    • http://jogisav.epizy.com/petusibakamew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07045583-78fa-4fee-afd2-686f8d74a0c3/how_to_solve_a_2x2_rubiks_cube_2_steps.pdfIn PDF document text
    • http://veridipu.rf.gd/61920812538.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_385773140c4942b88135aa6054f62a17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ff0239-5a33-4e57-ba2a-1e8a5f63821f/how_to_reference_the_declaration_of_independence_in_apa_format.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_e825ae44a1564ffe85bb9293019b24ad.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_33cbfc9811a647a89cf4b4c86daa321d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f609ce24-24c3-4574-a181-e6821b89c2b7/the_art_of_the_deal_johnny_depp_full_movie.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5180 bytes
SHA-256: e3f692021b187c42c6ca2f04e6898022d13fb71fa40a8abcc49fafb3c1dd9fca
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 5000 bytes
SHA-256: 667819b956fe9f453e088186a05c09ded7adb75293e4e210ad9ce9b02b1e3165
font_02_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10768 bytes
SHA-256: 284a7fc13aa080c1d3a9e34d6e2268da545ad5bdc4feaf5f29315bd6aedd0b0a
font_03_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16212 bytes
SHA-256: fc4a7825cf4c0e57e3522fcaa26ca549a2c2fe3786759935493ecdca1570bae2