Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be319ccfb2212c9…

MALICIOUS

PDF

86.3 KB Created: 2021-04-03 15:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a92c59d6291f6c16b3387ff265450cd SHA-1: 56b3a417d40e20f12dc4ae86f23639d25c39c7a2 SHA-256: 6be319ccfb2212c997d9a4e5c576e88b6b7567a4de2878bb7425fb97f5b792ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/aws?utm_term=types+of+storm+fronts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486037/normal_60512970c0db2.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/24549717781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5ff69b0795a6c.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/16103957539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5ff94fe564cff.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/24633483925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_40c7cd7e27854600b32a3c16e641c603.pdf?index=trueIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_8954b22ce8244ea9b3617d3b9f90b374.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_e4d1ab7af0f14c6785112d0050a532d8.pdf?index=trueIn PDF document text
    • http://xosifewogilopu.epizy.com/82169265775.pdfIn PDF document text
    • http://noratev.myartsonline.com/21460242519.pdfIn PDF document text
    • http://zikefibuji.rf.gd/modal_verbs_grammar_explanation.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_1e01d9dde9e74892b3cf20b3d266c14d.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_f421a21b9d0445dc9783987281118e2f.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_fe90bea983f1420a98a3161d88a750ea.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_55ac3393edff44dc8b2c7e50d0237316.pdf?index=trueIn 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_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 4856 bytes
SHA-256: 9b6094d1bafcda40ea12a74b9e44ee384acfc96374ad5baf28f4f167cb308ae1
font_01_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 12088 bytes
SHA-256: 1d715d881fcd3a617443581c645299ff5354e7f2f0d77250d0b63a4b28d7a99d

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