Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b73c371f9f428c…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 03:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d6983fb3304e5947c80b0c04eadb1769 SHA-1: 58c90fdf399878896af9b0e94c19b0e81ef492e9 SHA-256: b5b73c371f9f428ca0f65af6ceccae4de70f44fd028dc52b01175823b0bef8f3
186 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 6

  • 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.
  • 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://seumenha.ru/award?keyword=behavioural+theory+of+leadership+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426701/normal_6038637593fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_604ad5c732770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_6032aa0c28e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_60228be682e51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_60092988a1e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fd846ce8a8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_603d39b8293ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_603e8169d5798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55ad8d1-16e6-4c2e-b648-02033d7609b3/tp-link_tl-sg1005d_v8.0.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/building_icon_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/roku_se_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7239da14-14f4-4788-970c-99e94aa2ff9a/95202699269.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_1ed01773ccc54c81ba459d31faadc6cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3343b5a-253f-4ff5-922c-dfb053e03016/how_best_to_trade_bitcoin.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_640e9db7ca874102ab9c47be89d66dc5.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_b951e8c0d01f456a8be96d31f280203e.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_7b972d87e37b4e738bfef37ce5585116.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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 5340 bytes
SHA-256: 475aef840e99556474ea7b24769dca8214b454ea6a6ca8bb495a92de466ed9d3
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10792 bytes
SHA-256: 9691aad30a707573e5e4c7d051fcf650267a3146cd504a6d76aac237f6b90108

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