Malicious PDF — malware analysis report

Static analysis result for SHA-256 732baf9924b8f378…

MALICIOUS

PDF

68.9 KB Created: 2021-05-26 21:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaec5680dc46533011454232624049e5 SHA-1: 79d277cc39be059f4ee7788fd7dd3350aa9a32b7 SHA-256: 732baf9924b8f37881ce5fde69e0c79dc7ede2c546a465fdb363f2b5964ac64f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the ClamAV detection indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=rudin+real+and+complex+analysis+solutions+chapter+5
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/nedusanisofede-nikonitarerev.pdf
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/jomosenav-jonuvakot.pdf
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fcd369fef32c.pdf
    • https://xowasesulozuvuv.weebly.com/uploads/1/3/5/3/135347394/3897935.pdf
    • https://dawejufajipamoz.weebly.com/uploads/1/3/5/3/135350304/2720932.pdf
    • https://cdn-cms.f-static.net/uploads/4375351/normal_602b7f6e9c6e0.pdf
    • https://dosoxeluniwipeg.weebly.com/uploads/1/3/3/9/133997743/2382e204288.pdf
    • https://malodarugamizo.weebly.com/uploads/1/3/4/8/134853004/09e694.pdf
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6011f02f1ee7c.pdf
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5feafd5de605a.pdf
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/fujig.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_603dbb98bd317.pdf
    • https://cdn-cms.f-static.net/uploads/4445338/normal_6061947012dcf.pdf
    • https://cdn-cms.f-static.net/uploads/4470961/normal_60221860d693a.pdf
    • https://sinuvofibudibaf.weebly.com/uploads/1/3/2/6/132696377/nedav-bunuko-narinowi.pdf
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/xunewo-takikapaw-fevomuzep.pdf
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fd03431b213b.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_6027fb51313f9.pdf
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fefecccd21f9.pdf
    • https://cdn-cms.f-static.net/uploads/4459054/normal_603418a1cd8ec.pdf
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/kudobuna-zivazilat-buveb.pdf
    • https://cdn-cms.f-static.net/uploads/4463794/normal_6035dc1ca042d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1a366b9-2ce2-4ded-9b91-839b6a6d4b5b/63702532293.pdf
    • https://uploads.strikinglycdn.com/files/d26b3b38-fb16-4de8-88b2-8d542bd5fddf/los_7_habitos_de_las_personas_altamente_efectivas_libro_completo.pdf
    • https://uploads.strikinglycdn.com/files/b6b61b44-654e-4891-a0dc-a1829d338d13/48140235371.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_off0000cfc6.bin
7a56af48f6b13c1e509f5c79f5293390ce00543b90b8731fe4add881a05f09cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 5616 bytes
font_01_sfnt_off0000e2c4.bin
f9530b1e3fe5c994b8ae111786d3c23114a6ef5f5d58a6cb7151a153b895d387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10156 bytes

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