Malicious PDF — malware analysis report

Static analysis result for SHA-256 4007776054cd19eb…

MALICIOUS

PDF

73.5 KB Created: 2021-03-28 04:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 90e070f2c6dca1e10ad05587ea3365e3 SHA-1: cd18127a98c5a2ffe05948d448a6d71719bbc96a SHA-256: 4007776054cd19eb54755a54f8e84d475636982412c350d2a1611e45285555da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://pelibifir.ru/strik?utm_term=law+legislation+and+liberty+volume+3 PDF link annotation
    • http://cleanup-sale.site/butavufinutaposupegayye34.pdfIn PDF document text
    • http://rodakadodata.iblogger.org/agglutination_test_principle.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/igR8xJe/15551566808.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/UrslmpQ/top_10_marketing_companies_to_work_for.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/jehhaXV/56193068113.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/tafseer_ul_quran_in_englisheun8r.pdfIn PDF document text
    • http://itwow.info/autobiography_of_a_face_audiobook_freecn1sk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1699752-4433-48ed-863b-f68c0a0358e2/jack_reacher_series_amazon_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a5ba923-d862-46d6-bb3b-391cac646dc7/add_downloadable_to_wix.pdfIn PDF document text
    • http://refomuvuves.rf.gd/hypertrophic_cardiomyopathy_guidelines_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/32380043776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2c5b49-02d3-43ab-ad68-ae35ded48a95/72934890387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ac749c-b016-4ce2-a135-f12a19fdf4cc/how_to_write_anything_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6664e989-9956-412e-a73a-7656d453a922/flowchart_symbols_used_in_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c283c349-d9a5-4e8e-9b8f-4e4cb7cc5d49/what_type_of_oil_to_use_in_husqvarna_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/buildtopia_apk_obb.pdfIn PDF document text
    • http://porumujowupof.epizy.com/setesilevopojegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f2c3b3-c74a-467f-8c7d-5a124608d6af/zuzuzesemepidaxow.pdfIn PDF document text
    • http://mevomum.epizy.com/mastering_the_art_of_french_cooking_bruschetta_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4527f7-2d2b-41e1-849b-b98565a0950b/super_mario_bros_2_japanese_box_art.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 5644 bytes
SHA-256: 516ac70679402e004419d738a653e613602e0e82283b746937972ef1b2946370
font_01_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 11032 bytes
SHA-256: d34a227f8d9bbc6470b6a5c72a420794360a9b727bfa84c03a99886b6dabb68a