Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c626819116090f…

MALICIOUS

PDF

64.7 KB Created: 2020-11-13 01:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fef06bcf38c1122d8184437bb9c54ce0 SHA-1: 19648409f14454c0e757096babcd77ecfacd06a6 SHA-256: 55c626819116090f7cec24a38ca35de68443d85a0dee02cea1083f5f39724315
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of a large number of external links, many pointing to Weebly-hosted PDFs, suggests a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it's designed to redirect users to potentially harmful sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=forming+ionic+compounds+worksheet+2
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/buterisojek.pdf
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/dapemovifolera.pdf
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/f1e0de196a.pdf
    • https://fupexojor.weebly.com/uploads/1/3/4/0/134017307/e0d996419d12b5.pdf
    • https://semefaperovupiw.weebly.com/uploads/1/3/4/5/134507497/b42bb1fb91.pdf
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/guximusad-kolag-vujefurotodat-zejak.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/dufurifezowa-tedozafojo-katowisasanuja-dakikipuku.pdf
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f8fb8e52108b.pdf
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f891482c888b.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vekodupiwarobi/momufami.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/edhesive_assignment_4_answers_python.pdf
    • https://s3.amazonaws.com/kovilowab/pathfinder_druid_guide_treantmonk.pdf
    • https://s3.amazonaws.com/welutizenop/zheng_jie_ut_dallas.pdf
    • https://s3.amazonaws.com/jafujasiwetid/14309446486.pdf
    • https://s3.amazonaws.com/divikufifir/what_studies_all_forms_of_life.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_off0000bff4.bin
66169a5bebcee0bdbbc942b1f3c4af10cb1db999f41c161916056a0229361b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 5488 bytes
font_01_sfnt_off0000d296.bin
cbaea5826bfc45c309b3af60a362eac2338425cf47e322ee849fd2bdb747a466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 10584 bytes

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