Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18db926eae02a82…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 22:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53a37f5400a21ba1c48057e98d1c12f0 SHA-1: 596472a1ff3836061c2253aa3f9674d7ad0c79d1 SHA-256: c18db926eae02a82acc90c03029b994b68015162c8fd13b53ed84a3a2adf72e3
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 hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly unrelated URLs. The primary malicious URL identified is vilenefex.ru, which is likely used to host a phishing page or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=brother+serger+1034dx+for+sale PDF link annotation
    • https://cdn.sqhk.co/boxokozofe/ggEJghn/vitamin_d3_supplement_dosage.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/2386256.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/fed40356.pdfIn PDF document text
    • http://static-get.top/free_9_11_images_for_facebookh1j86.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/venipe_rofurogu_vimipidezowos_mejutuxuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fc5d9a5d786e.pdfIn PDF document text
    • https://cdn.sqhk.co/zijatiki/Jii7hg8/fepejotejaroravo.pdfIn PDF document text
    • http://itravelimpressions.com/vocalise_piano_solo_sheet_music233bq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_60354d4c32a0b.pdfIn PDF document text
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/vimeninaxu-nelegomoviwag-latikijuvoti.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/xamibebulosaxug/what_are_the_characteristics_of_the_third_estate_french_revolution.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/dragon_city_breeding_guide_rare_hybrid.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/43948251467.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/staples_mailmate_m3_shredder_manual.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_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 5732 bytes
SHA-256: 06e9924ac58020ecbfc20a81b5ed8b2852ebd0526b3e2c7669615ba2ca8d25c6
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 11452 bytes
SHA-256: 1170a6eae2dbe624a7eaacd1183cb02ad3c049e63e1d7b9d7639992fd5d8c331

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