Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39852e487aabbf4…

MALICIOUS

PDF

66.7 KB Created: 2021-02-22 06:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dfadd632ece20697b3e5adaecabc132 SHA-1: e4521f81b2d6f307c818e9c521bbfb7f83c6af60 SHA-256: d39852e487aabbf4f35135712e4a16ee1141046ba8213259f70e97631b06b97b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on Weebly subdomains, suggesting a link farm or distribution network for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF's structure point towards an attempt to redirect users to potentially harmful sites.

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://maypoin.ru/wix?keyword=limiting+reactant+stoichiometry+worksheet
    • https://bivunuse.weebly.com/uploads/1/3/5/3/135392281/lemolegagigewo.pdf
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/258468.pdf
    • https://foguzutaporoma.weebly.com/uploads/1/3/5/3/135322660/e6233bb5d6a22f.pdf
    • https://rilolani.weebly.com/uploads/1/3/4/4/134459611/wotetatunan.pdf
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/22f6903d6c65a7.pdf
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/dolegifaweluxisojifu.pdf
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fdde731ceb61.pdf
    • https://static.s123-cdn-static.com/uploads/4389830/normal_5fe1168928e4d.pdf
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/9371579.pdf
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/nifijetava-sijuzovi.pdf
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/fegoje.pdf
    • https://static.s123-cdn-static.com/uploads/4455399/normal_600484871e10e.pdf
    • https://manasowugarubib.weebly.com/uploads/1/3/0/9/130969960/304234.pdf
    • https://gidisapawifo.weebly.com/uploads/1/3/4/6/134611794/709019.pdf
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/supabilaxarimoke.pdf
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/ad33e74c98216.pdf
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5fd7858f4a301.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://beturatigamoli.epizy.com/frog_anatomy_labeling_worksheet_answers.pdf
    • http://dibesefar.epizy.com/utorrent_classic_for_windows_10.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_off0000c632.bin
766489c408d6f32e37eef1bab82fa180372c018fea8b88e910cf7e836c845798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 5380 bytes
font_01_sfnt_off0000d871.bin
4dd2af46cbf12389b9e8ad956f448625dcf5d1e66dc49a03c86294660b607394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 10388 bytes

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