Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90308e6b02e35e3…

MALICIOUS

PDF

78.3 KB Created: 2021-02-24 07:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 84bbd8be90921a944c90d522e473b3e2 SHA-1: 9c295fa7de1ec2d3fe45fa441b55ed2487719e38 SHA-256: e90308e6b02e35e3425a45d39cc682437664e4abf5e50666adc3021c99375e11
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a product search, likely to trick users into clicking malicious links.

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://maypoin.ru/strik?utm_term=waring+pro+dehydrator+beef+jerky+recipe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461204/normal_6018fa0acf5fa.pdfIn PDF document text
    • http://puxumelopiw.22web.org/zibixu.pdfIn PDF document text
    • http://nesadurem.22web.org/58745899563.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/premier_nutrition_shakes_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_602c74a74748b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_602e66a910795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_602efb4d935a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_601fe83e02f12.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/hl1hbjh/demilo.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/dinuvevetudeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fdc730b08091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_602ad0fa16427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454820/normal_5fe15d845517c.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/jight6B/87212118449.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/gmogdhf/lasejobos.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/6116586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nubuwij.epizy.com/51148409982.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 5392 bytes
SHA-256: 7e05e4173f4b9607e8eb13c71fb40148c2882473a04d01442ec126cb143317cc
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10316 bytes
SHA-256: 12727d57804a07c61960a73d77cda11ff66cafebf1946d9e6e76e8477a164f89
font_02_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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