Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0526b07965ee97…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 19:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 08241fe76a36e3ffd095ad8c83a5cba4 SHA-1: 45a0d3cb938e4756222c0bd588b739438b4c68fa SHA-256: 4e0526b07965ee9738d6938bad79dbcd4618241d3d839dc94061ac0d08c66ebc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://vilenefex.ru/strik?utm_term=excel+vba+programming+examples+download+pdf', are likely part of a social engineering attempt to trick users into downloading further malware or visiting phishing sites.

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=excel+vba+programming+examples+download+pdf PDF link annotation
    • https://cdn.sqhk.co/vatuliwa/jbjhkji/font_sans_serif_bold_font.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/gizerutox-zaledewemowade.pdfIn PDF document text
    • http://xunidar.iblogger.org/mobexiwubirifuzux.pdfIn PDF document text
    • http://nuvotana.22web.org/california_rules_of_court_citations.pdfIn PDF document text
    • http://indonesia2health.online/781603147628jihz.pdfIn PDF document text
    • http://trokot-online.xyz/ultimate_general_civil_war_confederate_campaign_chancellorsvillec1ghf.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/lejuke.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/jFjgibI/zilumekufinabavu.pdfIn PDF document text
    • http://dommasters.site/tarodasunarenujodovinhng5.pdfIn PDF document text
    • http://pasendapp.online/are_there_any_bison_left_in_americatki86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_dc1ab51cb5eb40ac8f912cb9b8ee58db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6263de-4e19-4d23-91ed-ce02feb20ce9/xegiba.pdfIn PDF document text
    • http://wofuxuvo.rf.gd/juwegelubivedolujosal.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_931feb1c20fc4229ba4f6d50db63659b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef1dcd2-514c-48d9-8a5f-0f2c113bb287/90025514941.pdfIn PDF document text
    • http://fezobuvetole.rf.gd/sip_caruman_form.pdfIn PDF document text
    • http://mogexusa.rf.gd/what_is_your_due_date_in_spanish.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_7fbc354432784136b6e98612d4b92100.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 5500 bytes
SHA-256: 2ba99223a0fc91612e46e791bb18d6aaac41640bfc79ae7cd79c856cbcb1f0c3
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10148 bytes
SHA-256: d2f836b24711116b38c93a9af745c6872f7f39930bdba955906719c0029f38f0
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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