Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3b0fda7e9d3ee3…

MALICIOUS

PDF

74.9 KB Created: 2021-01-24 16:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 03c71ae7c555042cb3e525b3d3a8e84f SHA-1: 74b692cf3b5617dd84dfbccea6b8640d6c8be0da SHA-256: 2a3b0fda7e9d3ee31f06405bd9aaddbda75d1188798b29d152c6ee5986c56e15
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, including one to a potentially malicious domain, strongly suggest it's designed to redirect users to malicious content or download further payloads.

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 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.
  • 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/123?utm_term=types+of+forces+worksheet+middle+school PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5fe38607de30b.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/6323846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fdc505e9c71b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_60047b9568f70.pdfIn PDF document text
    • https://seritixatot.weebly.com/uploads/1/3/1/0/131070849/5126781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5ff4fd850ba5e.pdfIn PDF document text
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/tonaxunogure-vifas-nawekunenesowi-tawav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5fe93c19180b8.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/fa80175b6c213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5feef81bc0d45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajovufozimok.epizy.com/apk_video_streaming_di_android.pdfIn PDF document text
    • http://gorevifero.epizy.com/antifertility_vaccines.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/2004_chevy_ssr_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/shinchan_hd_wallpaper_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/28317694775.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/71292106957.pdfIn PDF document text
    • http://tutivute.epizy.com/fikevubanebapojukuzez.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/bodybuilder_s_nutrition_book_franco_columbu.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/texuxurekas.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/acrylic_sheet_thickness_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/ccie_security_syllabus_2018.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5392 bytes
SHA-256: ca4fd678bb00f9e215e744d26e2374d38391ecf7a6f145e8f869f5b252ee68b2
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 10440 bytes
SHA-256: 79dccdc9a851b1135a78296ccbd96ed0d4ad36d991f2aaabd29eee136e72efef

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