Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bc867716253ff7…

MALICIOUS

PDF

83.6 KB Created: 2021-04-14 13:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ede44a4469bbc3bdb6443c0225a72c92 SHA-1: c19376beeafa6a37196f7b7d9b95da509d863bce SHA-256: a3bc867716253ff7f9edf63d5b7e50014cfc2affcba9728d0c5b5a53e3c8be7a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of embedded JavaScript, though not fully analyzed here, further supports the potential for malicious execution within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=line+6+spider+v+60+review PDF link annotation
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/8898830.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/302847.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/56d9e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_603891fa1a2d0.pdfIn PDF document text
    • http://efarbok.xyz/62309493934schmp.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/1390127.pdfIn PDF document text
    • https://mudekireziwafa.weebly.com/uploads/1/3/4/7/134730614/bobuxed-samewuzuroroku-sewadexu-zagano.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/ladomex_wajej_jopaxinawesifid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_604ca952e9632.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/3725889.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/d7b62c45.pdfIn PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/47e8df4508d9f.pdfIn PDF document text
    • https://moxisubisoxotap.weebly.com/uploads/1/3/4/8/134893280/3970902.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_60421dd1bc74f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5ff65ad9733f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5fd1e8c8102ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_6003cd7396f72.pdfIn PDF document text
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/344413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 5100 bytes
SHA-256: e08f7e4b24d37223b34a2bcbd79c643d8c78c0cec2955662555118e4e240ea98
font_01_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 10860 bytes
SHA-256: 4d7bd04d6be708f8716d320c1adbb180a9ef9681468b325ad7f898668b9b5d3d

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