Malicious PDF — malware analysis report

Static analysis result for SHA-256 808f83ec6080d36c…

MALICIOUS

PDF

77.7 KB Created: 2021-04-05 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6b17623f55c7f8edfe2e679345a2f32a SHA-1: 63880e04d02a4d3c83a0b1c8ca2c38f56714ab79 SHA-256: 808f83ec6080d36cfa06df022c71e3a26dd3b1b50cc889a1b0831b5abb85e878
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. The presence of multiple disposable hosting domains and UTM parameters in URLs points towards a coordinated effort for SEO manipulation or distributing malware. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=diy+mary+poppins+umbrella+handle PDF link annotation
    • https://cdn.sqhk.co/loxinesupiva/4elcCy4/wallpapers_for_nascar_truck_series.pdfIn PDF document text
    • https://sajixigepanosu.weebly.com/uploads/1/3/1/0/131070231/dazul.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/83706442779r4dge.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/0gehiDH/gaming_hd_wallpaper_for_pc_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/sujoxeti/fhehgYk/vegetable_chopper_mandoline_slicer_dicer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487665/normal_5fcc56612cd1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60343ced849c1.pdfIn PDF document text
    • http://antinomi.design/business_law_cases_for_studentsxgg7k.pdfIn PDF document text
    • http://excschool.ru/nibalavespdfc6.pdfIn PDF document text
    • http://masito.space/2010_camaro_rs_v6_horsepowerl6prn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ff288fb3f775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_6052c1fc3a787.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • http://lanufutado.22web.org/celebrating_success_and_failure.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/bakevinonabi.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/gqjGsNf/15617293694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suziwifu.rf.gd/java_compiler_javac._exe.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_f08a881621d8425ba130238f1bda12f8.pdf?index=trueIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_0b58525342194dd38f6a4630be555ad5.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_8beea258d58d44719193c15e875dd4e9.pdf?index=trueIn PDF document text
    • http://vikarexazoz.rf.gd/visible_absorption_spectroscopy_lab_report.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_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 5440 bytes
SHA-256: befa9d08912379f2f4acc3c3d46d86d4479a9b63a8938fb18cec79a6a9e32809
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10652 bytes
SHA-256: 9c934e42785d0e51c4d735726031e56a0530a0656e069f16f11aa0a9734c5311