Malicious PDF — malware analysis report

Static analysis result for SHA-256 fceb5b75b5b19c8c…

MALICIOUS

PDF

87.5 KB Created: 2021-03-30 05:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73f0bcf35abb5d943a759d1cd2201dcb SHA-1: 72b0f191e3c00e8e6e9dba345f2e2566ecdb04a5 SHA-256: fceb5b75b5b19c8cbbf9613c48903316622294d32344f4dce1bb88485bd92181
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. One of the extracted URLs, https://ponafet.ru/strik?utm_term=yamaha+ef1000+generator+carburetor, is particularly suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=yamaha+ef1000+generator+carburetor
    • https://fopepusev.weebly.com/uploads/1/3/1/3/131383694/2200235.pdf
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/89728.pdf
    • https://cdn-cms.f-static.net/uploads/4422908/normal_6040abe346d18.pdf
    • https://merirano.weebly.com/uploads/1/3/2/7/132710628/7f275a.pdf
    • https://visoruze.weebly.com/uploads/1/3/4/1/134109001/puvoxajubovipofa.pdf
    • https://zodefamebatum.weebly.com/uploads/1/3/5/9/135967531/lonumefir-voguwe-wivasukadibo.pdf
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/c946f3.pdf
    • https://cdn-cms.f-static.net/uploads/4473388/normal_601b666e184a9.pdf
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601d2b4907512.pdf
    • https://cdn-cms.f-static.net/uploads/4388596/normal_60329056ea8b4.pdf
    • https://wuxagukokixeg.weebly.com/uploads/1/3/5/3/135398542/xurepumufefos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_c1251db005e840e9a7805ebc496ea797.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_335bdadff07e495eaa2b27ef3854b604.pdf?index=true
    • https://s3.amazonaws.com/vuzotisenixava/doesn_t_mean_anything_piano_sheet_music.pdf
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_feffb003638446fbaa1d51f00711c0e6.pdf?index=true
    • https://s3.amazonaws.com/wudibirewuduto/sharepoint_2010_user_manual.pdf
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_a417b27002d3443c81be25c002878ff3.pdf?index=true
    • https://s3.amazonaws.com/voxulija/20240995857.pdf
    • https://s3.amazonaws.com/taguxif/a_random_walk_down_wall_street_chapter_2_summary.pdf
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_aa71de7b6af34c02908efa35d9a2a41f.pdf?index=true
    • 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_off000117a3.bin
780af6940a0476c2488fb832677d5fe9f060d311e96275bde84fb74f764887c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 5380 bytes
font_01_sfnt_off000129d1.bin
145291e2df529a4406028c72ad40f638d49d8fc1f04ce4a1a7ba3c10107f16cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 11312 bytes

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