Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c94ce47e1fa6f4…

MALICIOUS

PDF

84.7 KB Created: 2021-01-15 06:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9b4891adad37e99f1f8ddfe1dc9e8b88 SHA-1: ec822d2b4c39d7a8373460309121d6d1cf5d9a77 SHA-256: f4c94ce47e1fa6f4f06bc500ceec4781c775fff9b082d53ed7c9217202c47fda
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The document body's content, though heavily obfuscated, appears to contain metadata related to a product manual, which is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?utm_term=bialetti+manual+hand+coffee+grinder In PDF document text
    • https://cdn.sqhk.co/gisopagipize/CicwUjb/arijit_singh_song_download_mp3_bestwap_dj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f874c34adb6f.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/EzjgNLl/56590386363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367665/normal_5fc66d7384b91.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/naxenupedufadex-maxivetuxuxoli-vavevaje-rofurijomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_5fa0c2d5af505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425909/normal_5fe157ae500ba.pdfIn PDF document text
    • https://site-1177042.mozfiles.com/files/1177042/47105440263.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/sefepugolupalax/gcse_maths_inverse_functions_worksheet.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_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 5304 bytes
SHA-256: 3cc29fbe375398d072f273c8ceb35d427e982cbc97b90c9f8d6936cbf2ec60fb
font_01_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 12580 bytes
SHA-256: d78a7dd0c3f1e2a0f2b5cf00884b57014ce121bd05e69ffa13cba7188d7b6123

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