Malicious PDF — malware analysis report

Static analysis result for SHA-256 e855fb5bdd12c93d…

MALICIOUS

PDF

76.4 KB Created: 2021-05-08 11:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09c0f8640f8a91b27b14f65966454e56 SHA-1: d7157ef63f269b2bc991567cb0ea76af2905d39c SHA-256: e855fb5bdd12c93d7cd87804d8fdcbced183a74c21934f93c52da3bcd473a135
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://pelibifir.ru/strik?utm_term=cisco+sg300-10mpp+replacement PDF link annotation
    • http://vknacruckalaikov123.xyz/taisha_marie_pornekeb2.pdfIn PDF document text
    • http://4bochki.ru/litenh2s71.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/nalukugu.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/north_carolina_criminal_justice_education__training_standards_commission.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_60558bbd1d2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_601260f173b8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekezaru/nuclear_chemistry_chapter_test_a_answers.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_e653a71955b043a0abe70c6b0157246e.pdf?index=trueIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_b8633baf14d44a7ca6c3331966834f96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/update_android_studio_manually.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_cce4636c59f740d99533d6540eaf0b4f.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_d1bb97e4291b4d80953a11dd690f6ebf.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_7fcfb04f0427489a83ac8f337fd20902.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/xorumafusamexubero.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/how_to_get_autopsy_report_in_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/data_analysis_histogram_excel_2016.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/86026528133.pdfIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_5c24116029e740c992ed98d294f3b9ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/universidad_autonoma_del_cauca_carreras.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 5548 bytes
SHA-256: e8365d0e853023585889cfe211c68eecc1931feb7b084a4416ebefa40734602b
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 11004 bytes
SHA-256: 1e8e0f73e7c0e27e2ba11e90db0e970301e41c49586e012a716b1ebd75828130

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