Malicious PDF — malware analysis report

Static analysis result for SHA-256 153778a8c962ca6c…

MALICIOUS

PDF

78.4 KB Created: 2021-02-16 01:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 917c3676496a6d36026d798d1f2220aa SHA-1: 9695e24ff9fb1781ccb8e4a02a1189ae60f35223 SHA-256: 153778a8c962ca6cba98cc273b9386d7e6b846891e9b3dcc11432139f9fdc970
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to a 'visa application' and embeds numerous external links, many of which are likely part of a link farm designed to obscure malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, consistent with a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

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 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.
  • 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://seumenha.ru/strik?utm_term=solicitud+visa+de+novios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480383/normal_601dd74eae65b.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/vasatexawod_nanawife_kezor.pdfIn PDF document text
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/tibuzez.pdfIn PDF document text
    • https://volafonozus.weebly.com/uploads/1/3/0/7/130775232/6233879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fcd098d79241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fe679203704a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fde69456c9dd.pdfIn PDF document text
    • https://bimeriwuju.weebly.com/uploads/1/3/4/9/134901074/dofuboga_jajov_jeseja.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/77ce4c220dd79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_6015c474c2d57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fee95ecdb7ba.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/vetifikus_javoviwubudevu_vimasamigad_gopom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_602af4bd1fed0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391921/normal_5ff7dcca4966f.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/dugibabafod/marketing_information_system_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/wapem.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/74777234120.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/vunogi.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/97234599254.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/kagir.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_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 5000 bytes
SHA-256: 4c8bcc0740f0e6386934741e08c07730dbc55a0efd523a546e5109a0ecd5f305
font_01_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10892 bytes
SHA-256: ca6e62cbb5306c226bb73a995076fb19212864cbad08c08ffc3f6735fcd56377

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