Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9dca3ec3ac36c0…

MALICIOUS

PDF

82.0 KB Created: 2021-05-03 20:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d6fdaab834776134e4104a59b8ffce3a SHA-1: 5ebe1ee89f403f5d34680ef7adbd011318e7444c SHA-256: 6e9dca3ec3ac36c03a146bb651c66f68d255f5fc41c1ca0db0218ae4626fb1eb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of external URIs and a link farm heuristic suggests an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=dell+inspiron+one+2330+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd8d5e715b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_60662ce84dfa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fcaf68c6b3bf.pdfIn PDF document text
    • https://ligunoko.weebly.com/uploads/1/3/4/3/134308404/3819ebd65.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/assam_tet_question_paper_2020_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fda98e4d43c7.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/zadeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5fd131f8d4ce4.pdfIn PDF document text
    • https://wijuluvewez.weebly.com/uploads/1/3/1/4/131437378/nunazavep-gululajoxubop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fca4dbd272ea.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/logical_link_control.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_6024fe10edebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujugabudejise.rf.gd/dasejaw.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_dc4f78457f4e4e8aacdba007700ac1ff.pdf?index=trueIn PDF document text
    • http://vovugawe.rf.gd/que_relacion_hay_entre_educacion_fisica_deporte_y_recreacion.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/b_j_p_ki_full_form.pdfIn PDF document text
    • http://duziroro.myartsonline.com/papuwaraburujusekuduk.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_c1e323a0e73a4084bd4e3d49150673de.pdf?index=trueIn PDF document text
    • http://nutajowaga.rf.gd/79468286372.pdfIn PDF document text
    • http://befokube.rf.gd/pujewuxaxutovavun.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_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 5400 bytes
SHA-256: 0913fd726706c322664a586107027553bb3bc670978aa132754e5872468f8daa
font_01_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 10636 bytes
SHA-256: 1abea8768a0f0e7809b7126792b6c2eff015c79116d708437e62d0a234d0ec1a

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