Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b372e68d1b5b20a…

MALICIOUS

PDF

74.6 KB Created: 2021-04-03 06:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c5b5d771cde0bc4a5a3341ade69e9491 SHA-1: 7ed07bd317aee20e6ca5c555e5e903121772de9c SHA-256: 5b372e68d1b5b20a2c52b8e91e970aa37610001e489d2cf886f7ae0de1abaf76
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary URL, https://xajibur.ru/strik?utm_term=what+year+is+go+ask+alice+based+in, is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=what+year+is+go+ask+alice+based+in PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6046249d1af3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_6052a35a4383c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fd16408e062d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6038629581157.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hdph5IK/57202300326.pdfIn PDF document text
    • http://fotirub.iblogger.org/santos_bonacci_libros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_601a115588700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fc60334b254c.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/HAhjhff/comcast_stream_apple_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fdc2aa82b1de.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/openmodelica_fluid_tutorial3agaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_6062c16d7d385.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://coupons2020.info/free_to_air_tv_guide_sydney_tonightz8ki0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_5e0d2cf4908d4b6c88504a8aa5c80cf0.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_aa47ff01d3fc48f89fbfe6fbe93b0874.pdf?index=trueIn PDF document text
    • http://karajifaderiwow.epizy.com/job_application_format_for_teacher_post.pdfIn PDF document text
    • http://segalemu.epizy.com/approaching_the_unknown_full_movie_hd.pdfIn PDF document text
    • http://woniladorunuf.epizy.com/studyladder_printable_worksheets.pdfIn PDF document text
    • http://zasufogokalo.rf.gd/xagusajeset.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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 5520 bytes
SHA-256: 1f1a94801871a2331575fb87ed76d2c062ea8948b369567cc44d12657721ca5b
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 10820 bytes
SHA-256: 8ad6ce83f70f8f032560af834027c5e225d3bf4f7b5948b96318caf747ebb129