Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f3981fe3ad35c1…

MALICIOUS

PDF

78.5 KB Created: 2021-01-06 08:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 11fdfb329b668f4a3d8a202be422497e SHA-1: 53cbf4fc98918bb31ea843e185acb238dc4ac7a2 SHA-256: d9f3981fe3ad35c16ba7a5630dac97539ae396aac3a6eadb6fb97cc3f13c53ea
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. Specifically, it attempts to trick users into installing a browser extension or update, a common social engineering tactic. The embedded URL points to a suspicious domain, likely serving as a download or redirection point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffe.ru/123?utm_term=official+showbox+apk+2019+download PDF link annotation
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/79ea4286.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/bgcjfgd/car_price_calculator_quikr.pdfIn PDF document text
    • https://vazitaxigenot.weebly.com/uploads/1/3/4/6/134640409/rusasurovakela.pdfIn PDF document text
    • https://cdn.sqhk.co/gitesafuwu/gVnl6jd/world_war_2_begins_quizlet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f8cc27310a16.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/9170a542-8157-4ce4-953b-4542938f20df/sejuwevavapas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543780e5-b6f7-4bf6-a77c-ebba7ad33963/how_often_will_youtube_music_update_download_favorites.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/94571468421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b1bdfe-4f6e-44c9-836a-81c49aeb118e/lopugaziwokifedumajezage.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/31193776314.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_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 6020 bytes
SHA-256: 239123adcb04db9779d02306cf023d474c5f0d134bf4385c1901fcbb444f7859
font_01_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 10892 bytes
SHA-256: 3c3fb86875cd739815f5bf48c110a1d850c18745e009f3e36a779b1d0b5d05dc

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