Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f48b9e1d8b95a07…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 03:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc32c13fc8157d3b41d92e4bb458a577 SHA-1: 2f8df4adbe0c525eb66d85283a31b29407b59d98 SHA-256: 7f48b9e1d8b95a0762f78e067f4cd0feacc8ff921a3cb7ae25b93cc875aa3699
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating a remote support tool lure, instructing the user to install software like Ultraviewer. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for unauthorized access. The embedded URL points to a domain associated with this lure.

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://druttle.ru/123?utm_term=ultraviewer+for+linux
    • https://cdn-cms.f-static.net/uploads/4486367/normal_603b6f7ad00ce.pdf
    • https://cdn-cms.f-static.net/uploads/4495843/normal_60469e1cdd8af.pdf
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5fddd8dc9953f.pdf
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/5589ae.pdf
    • http://jerugujekema.getenjoyment.net/96181745900.pdf
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fdb1fb29f6c6.pdf
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/pelogexuraxizop.pdf
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5ff4ff17353a6.pdf
    • http://fidesuwuranotif.getenjoyment.net/kobufoxavonax.pdf
    • https://cdn-cms.f-static.net/uploads/4445868/normal_603586a618979.pdf
    • https://cdn-cms.f-static.net/uploads/4453730/normal_60171b4a461b1.pdf
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/8486ee343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_27275a56f6bb41d88fee8331accfdefb.pdf?index=true
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_9565f421e7bb4f5fadca51ba59140ba2.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_4951db91943b426486ef0d29f7c08d8c.pdf?index=true
    • https://s3.amazonaws.com/neporezofov/the_masque_of_the_red_death_theme_statement.pdf
    • https://s3.amazonaws.com/gixawetopoli/darling_harbour_map_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90e.bin
7e1b849f9b81a61c4ef702c5daee659d371665f93b7fcea968745ef67e59fe51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 4792 bytes
font_01_sfnt_off0000f98b.bin
d3d870592a91865062d6c01eb51c3345b53a5324ad2c0a906a7c83ce6c25f63c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10888 bytes