Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5719b7282f2a6c…

MALICIOUS

PDF

74.4 KB Created: 2021-02-08 18:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5cb47e7208d535f95fe50dea84a15035 SHA-1: 42679f6c3981d99607723b3590a70c16770166af SHA-256: 7f5719b7282f2a6c70efa59bb7e7070ad1ac73901b973623b7a2acdb67ed3d85
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain text related to 'diagnosing diabetes uk guidelines', suggesting a lure to trick users into clicking the malicious link.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=diagnosing%20diabetes%20uk%20guidelines In PDF document text
    • https://cdn.sqhk.co/zupodejadofe/ggnijG7/ganenafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_600288f2e8cd1.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/b165b0ec.pdfIn PDF document text
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/96a7e4.pdfIn PDF document text
    • http://opticsystem.website/60127551155uuxwc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5fe40339767ab.pdfIn PDF document text
    • http://topsale.pro/free_throw_percentage_calculator0qrs1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_601e414118884.pdfIn PDF document text
    • http://ihsteam.ru/determinacion_del_punto_isoelectrico_de_aminoacidoskb7pp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fec4448bb65e.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/LMxieuG/turbo_dismount_download_2020.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/7762093.pdfIn PDF document text
    • http://eurosett.net/bejusuu2zxp.pdfIn PDF document text
    • https://jarowuvuvam.weebly.com/uploads/1/3/4/6/134614172/vobojoponerotivam.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/pisik/63873367816.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/homeostasis_feedback_mechanisms_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/vetijasulupi.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/54189664271.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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5100 bytes
SHA-256: b074dc9be156e2e99254cfab0fa9c4728d23b4cab0bd8c07cbc89043c0d89291
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 10200 bytes
SHA-256: 6b0e2836a45c44f080988d03166b93478ad8d8fa9a5d7a8933f21ef3e944c237

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