Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63b539c35af596d…

MALICIOUS

PDF

70.5 KB Created: 2021-02-20 21:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a340a3aa79ee22077255107948c1bae SHA-1: 869684c4ab00354d3ec9ce8542aeee6657665ecc SHA-256: b63b539c35af596d3d9160323df6150cb673c130122806f6c7dc58827e6f0232
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 a link farm detection and a critical ClamAV detection. The file contains a large number of external URLs, suggesting it's part of a link farm or a phishing campaign. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a potential for malicious content delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=richard+dotts+pdf PDF link annotation
    • http://lewodazegozi.iblogger.org/mitotic_cell_division_mitosis_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5ffcf6ed4f4e3.pdfIn PDF document text
    • http://hookup681.site/1382839639cylos.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/gunopiwedur-juren.pdfIn PDF document text
    • http://yesnutural.space/caterpillar_parts_manual_free_download252iz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_6022cdf42c03e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe0ff4fac556.pdfIn PDF document text
    • http://dusosax.66ghz.com/doboxoxotewonubesabuwutej.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/996414.pdfIn PDF document text
    • http://dusosax.66ghz.com/24383295884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463825/normal_5ff59483043d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5ff3da8a5351c.pdfIn PDF document text
    • https://gewolokumopez.weebly.com/uploads/1/3/0/8/130814623/2783826.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/b646a3673d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fccd4927abbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_600ea54475943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fef04b1d2192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe9812d04ac7.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/7921003.pdfIn PDF document text
    • http://afracheat2.xyz/nabezakodudobamidfo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezafenunuritem.epizy.com/narasimham_malayalam_movie_songs_kuttyweb.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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 5220 bytes
SHA-256: c865b7d0f081b330291073302d0dea8bfab5864b4194c99fcaa0886d4b8502bb
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10188 bytes
SHA-256: 4116708fa6ef3b4be668243bd912803f27eb7f664418ffc8697beefafbf41084

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