Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef18dcd1d4c18f…

MALICIOUS

PDF

74.0 KB Created: 2021-04-11 22:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0553de2a5233037537c0406dd8dda13f SHA-1: 037223ccec01a6c04212dccb8ea0d39ae3248b00 SHA-256: 66ef18dcd1d4c18fb5b4a257e53c8851df1c32033193785040d3fe950b733e36
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The primary malicious URL identified is 'https://nipisod.ru/strik?utm_term=how+to+install+minn+kota+terrova+trolling+motor', which is likely part of a phishing or scam campaign. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further confirms its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/strik?utm_term=how+to+install+minn+kota+terrova+trolling+motor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499653/normal_603ffd9b88d7f.pdfIn PDF document text
    • https://bubipirem.weebly.com/uploads/1/3/6/0/136086135/fisategerateje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fda80af475b1.pdfIn PDF document text
    • http://gojifoxedot.iblogger.org/ave_maria_gounod_violino.pdfIn PDF document text
    • http://mowewanu.iblogger.org/63215860364.pdfIn PDF document text
    • https://rapaxexujimina.weebly.com/uploads/1/3/1/4/131454932/294e1d4.pdfIn PDF document text
    • http://texegevesimiruv.22web.org/ms_access_database_tutorial_bangla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_602517d330fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_600e94decb573.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/julaxel/30313734616.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/50_shades_of_gray_soundtrack_2.pdfIn PDF document text
    • http://dopelatov.epizy.com/avionics_certification_test_study_guide.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_7d278e48f3e349e18209344a5c77d2cc.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_4f005053f397412dbf284a434367ab3e.pdf?index=trueIn PDF document text
    • http://podalirexun.epizy.com/4._4_modelos_de_diagnostico_organizacional.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_ec487b17fb2845918ee98ab44bb5ae2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/fuduwulalifomo.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_bf1d73b4f4a9491c990a31420979049f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/topurixop.pdfIn PDF document text
    • http://donaweraketo.rf.gd/giletamezobunipus.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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 5180 bytes
SHA-256: 6f0f979f56ae0fa6ffc2235cdff3281ae7b5543a015f4232e921a438dc47a251
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 11004 bytes
SHA-256: bf0f2a1c78b9df53848c5ca9b686be9af9f8ccb0376e3096e864e0e892a2f3b5

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