Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fd4cd6a1b07f99…

MALICIOUS

PDF

86.7 KB Created: 2021-03-31 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a963a618f01e058c291aec6ea6923d6c SHA-1: 51e8512d2f8585b88c45e5968b43fe455793dbc7 SHA-256: 64fd4cd6a1b07f997daa399b4cf25c33c952326eda3e6a6b0d3b7823838553ff
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate download, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=capitalismo+consciente+libro+pdf+gratis In PDF document text
    • https://juviroxekeko.weebly.com/uploads/1/3/5/3/135399696/zujisosunado_mikeli_funoruvoza.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/xelubuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fea39e6479c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_600c9b591dd1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_602a5974324b8.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/ti_sao_file_b_li_font.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503033/normal_602a9bcf1b743.pdfIn PDF document text
    • https://rixulajo.weebly.com/uploads/1/3/4/5/134585814/kusirer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5fe527e28ea78.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/anemia_classification.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/wagijakabigejavow.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/sivufaledeja.pdfIn PDF document text
    • http://sopidemeleket.mygamesonline.org/17070878576.pdfIn PDF document text
    • http://jisijopimif.66ghz.com/44420991031.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatamabudawuf.epizy.com/muwomozudarovolo.pdfIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_78e3fe4b1b2b459d94a27df72c28ea3e.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_414f47ba1e2b47a5b73c7d2dd571a467.pdf?index=trueIn PDF document text
    • http://fazobelo.onlinewebshop.net/believe_in_yourself_book_in.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/1360053668.pdfIn PDF document text
    • http://wovepelifuro.epizy.com/lesuguxebiw.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_f28c9b1ab0c2437291ec13b54fde99a4.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_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 5520 bytes
SHA-256: 722330c73ac064f4696b776d7f3d759e18b9ee89899e5770cba3bc42aca733a3
font_01_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 13176 bytes
SHA-256: 8ac04eb94249507caad4a4deb3efabe1c9eb3c04ef2e75a03ce724d1cc8adda6

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