Malicious PDF — malware analysis report

Static analysis result for SHA-256 43757234714a74e9…

MALICIOUS

PDF

74.3 KB Created: 2021-04-27 23:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fed1760085c216022ff950df433b67e3 SHA-1: 3ce5e0f78deae6e46417d5bb6cd1b552a07c878b SHA-256: 43757234714a74e9356cf537ca8c96f2d443268c558175306af273d2d0f5a522
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and extensive URL usage point towards a malicious document designed to redirect users to potentially harmful sites.

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://leonvi.ru/strik?utm_term=how+much+does+a+starbucks+mastrena+cost PDF link annotation
    • http://storeplus.pro/fovetejedobisewu6v1.pdfIn PDF document text
    • http://juxaxukavaxi.iblogger.org/cours_d_administration_systme_windows_en.pdfIn PDF document text
    • http://mylic.ru/18123008906ukmwd.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/2340824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5ff8a11415c8a.pdfIn PDF document text
    • http://zavutuwifuwe.iblogger.org/integers_for_grade_6_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_604cd93375945.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/believer_slow_piano_version_songz4a2e.pdfIn PDF document text
    • http://podarokinsta.online/lutatumuzodudovatidupefozjm5s.pdfIn PDF document text
    • https://binezorimitujux.weebly.com/uploads/1/3/4/3/134337637/pomelugiw_soguxilogozi.pdfIn PDF document text
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/e8260.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/0386ce439840e0.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/931c1d24a0942e.pdfIn PDF document text
    • https://futixaxez.weebly.com/uploads/1/3/4/5/134516919/nesabo.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/burowanoxubekapo.pdfIn PDF document text
    • http://lisipezasuk.iblogger.org/vupidoxomirifedotetataf.pdfIn PDF document text
    • http://pixxel.life/born_a_crime_book_quotesnsztw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6030718097a2b.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/eb3c373c-36d9-487e-8c0b-aa27d6f15712/9310990792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d910d5-a89b-4651-91d9-37d0fb537e65/tebiregapunatogapodevini.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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 5404 bytes
SHA-256: 3f13bb2235a9c0ee91355af6a6febf9d121a96bd310fc832fc528c1571a0daa3
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10792 bytes
SHA-256: 91200e8fe0707f15bf2088a8662fa86c62703f8bcc5c98b4c48edba1c1d0dc54

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