Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3baef303dd95a0a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-01 18:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b20e19eaefbf5e2638f2a7e2d2633ed1 SHA-1: 0d270105cfd3edd31c6bc5431d0c580607145860 SHA-256: e3baef303dd95a0a236959e91f006309e6d3a4dbf3b268e00e82cc21314d6d33
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a mass of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=honda+gc160+pressure+washer+5.0 PDF link annotation
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/376d8ba.pdfIn PDF document text
    • https://zekogogebiw.weebly.com/uploads/1/3/1/4/131453397/ponedawonikife_fawaligerazik_samosobifom_xakeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5ff3f46ee8952.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/bamuxapewavolo-zuputubezugene-jawiriji-nerojiridaneb.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/2050470.pdfIn PDF document text
    • https://mokitapakajare.weebly.com/uploads/1/3/4/8/134885173/bc63af81dcd67.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/welat-mibegeserozase-fezutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_60333c823df25.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/lipotuzesubel-zefuzalelu-tuxedavijeka-nukutivu.pdfIn PDF document text
    • https://labudadujuw.weebly.com/uploads/1/3/1/6/131637223/1471290.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/87587261331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390638/normal_5feb1a4d27f59.pdfIn PDF document text
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/kedojepo_tikagoxiridopiz_vezugivomujizu_nupewun.pdfIn PDF document text
    • http://jushq.club/what_is_a_positive_linear_association99ngb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_603973bf4618e.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/sezepirigiwaxosi.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/let_us_come_boldly_to_the_throne_of_grace_niv.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/gapuvekefeveliz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/wokugoradun.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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5860 bytes
SHA-256: eff6081c0ce65e73da6ba081ef4b79e111255632d1a6444832e7bdcd80bf318c
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10412 bytes
SHA-256: 44ff10576bab0caa6d5a239c79e9f6c6467da43fa2a636b1e6b9f9b48f8ab98b

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