Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e96cd6b85ede74…

MALICIOUS

PDF

76.0 KB Created: 2021-03-27 09:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1047f0ae6ccf7b23085ecb4635b2a15 SHA-1: aef62c8c5fcfb5391351d55ee7bd5c4c43796048 SHA-256: b3e96cd6b85ede74fa6557da577f7f95d97c8915fdd4eb1fc649706e9f0427e2
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The presence of numerous external links, many pointing to PDF files on various domains, suggests a coordinated effort to distribute malicious content or engage in SEO manipulation for phishing purposes. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=hpu+icdeol+date+sheet
    • https://cdn-cms.f-static.net/uploads/4485442/normal_604e77e5eba86.pdf
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/c1c7a.pdf
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5fd8775dc553c.pdf
    • https://fupexojor.weebly.com/uploads/1/3/4/0/134017307/sobaf.pdf
    • http://matizaw.mywebcommunity.org/75067700386.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_600ab3d5197cb.pdf
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/7581956.pdf
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/8a07551659fb5.pdf
    • http://lejifip.sportsontheweb.net/konosuba_light_novel_download_epub.pdf
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/soximuvoxapufax-zupogenirewidoj-lotamulazemi-buvute.pdf
    • http://wusator.mygamesonline.org/zunetuwenotovaluwus.pdf
    • https://static.s123-cdn-static.com/uploads/4371508/normal_5fe28ffe2bca6.pdf
    • https://cdn-cms.f-static.net/uploads/4446494/normal_5fda94d6cada5.pdf
    • http://poguzozod.sportsontheweb.net/grade_12_chemistry_formula_sheet.pdf
    • http://sowoxapexemex.sportsontheweb.net/model_airplane_news_magazine.pdf
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/zawavadavofazur.pdf
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/1652284.pdf
    • https://cdn-cms.f-static.net/uploads/4417659/normal_600d6fa51dedf.pdf
    • https://cdn-cms.f-static.net/uploads/4365613/normal_601386e75f0b9.pdf
    • https://zenalebib.weebly.com/uploads/1/3/5/9/135966912/5af3344cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/70069324910.pdf
    • https://s3.amazonaws.com/wegugus/what_is_coding_for_beginners_in_hindi.pdf
    • https://s3.amazonaws.com/fajetufekejo/company_introduction_powerpoint_template.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_off0000ee1e.bin
bbb238afd221e5a87d0059b49d9962a2248922f5b9995538dae53d3da6198324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5024 bytes
font_01_sfnt_off0000ff31.bin
3f07d38112d3a35da0d8d4c9dc68eda9528d7a1fef0969d8a35e79c4f3903de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 10412 bytes

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