Malicious PDF — malware analysis report

Static analysis result for SHA-256 e866658aad4b8e64…

MALICIOUS

PDF

75.1 KB Created: 2021-05-06 07:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d6acab32b34e177e191a0af774024350 SHA-1: 5b02df528b1b864dbea2ee6a966c4a24df570681 SHA-256: e866658aad4b8e64672a5c824f84b32dbb653ea459e0197a9e5fc82366a01327
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=star+trek+discovery+season+4+air+date PDF link annotation
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/bukapag.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/haMjbjd/rejedenetipikonavibala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_600809d76a90f.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/dhbheFa/rerekosedubumipasubad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_60642d0844250.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/9006783.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/jabibodir.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/terorujekimefeza.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/cd0e8c3b.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/83514ca781c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_e57c3305e37041e4976a8bfb7c907f9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/504eeecd-4520-4a2f-8240-2c28d9e22083/wahl_lithium_ion_beard_trimmer_attachments.pdfIn PDF document text
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_cc4d1ac988634576a76b932eebc43002.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc2cebd-9a39-449a-825d-16c906ebba9b/16877738159.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_5b029b9b2e384f13b1c63018730060ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf2853f-9340-48e4-9f6b-8656d967c404/44520629259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57469285-68ac-41f7-9cc4-064e5d22c355/24497380809.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_3ec9387857fa481da6ad391255a3aa11.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_01ab1a1ce6894df2ab6bd46574586c75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e2900f-3c8f-4d8b-bae2-5d50554bece7/55778164115.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_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 5316 bytes
SHA-256: 6f27fe7aab0e3bb0f00b407b32f37853b07dd6570e9013c59e022266178df4a3
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10848 bytes
SHA-256: 3e6111cc5c4546a52f48ab5f1a72cd88ea48e703af8593f981a699cc775d0ba6